基础类回顾

int类(整数)

所有方法

>>> dir(int)
[‘__abs__‘, ‘__add__‘, ‘__and__‘, ‘__clas s__‘, ‘__cmp__‘, ‘__coerce__‘, ‘__delattr__‘, ‘__div__‘, ‘__divmod__‘, ‘__doc__‘, ‘__float__‘, ‘__floordiv__‘, ‘__format__‘, ‘__getattribute__‘, ‘__getnewargs__‘, ‘__hash__‘, ‘__hex__‘, ‘__index__‘, ‘__init__‘, ‘__int__‘, ‘__invert__‘, ‘__long__‘, ‘__lshift__‘, ‘__mod__‘, ‘__mul__‘, ‘__neg__‘, ‘__new__‘, ‘__nonzero__‘, ‘__oct__‘, ‘__or__‘, ‘__pos__‘, ‘__pow__‘, ‘__radd__‘, ‘__rand__‘, ‘__rdiv__‘, ‘__rdivmod__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__rfloordiv__‘, ‘__rlshift__‘, ‘__rmod__‘, ‘__rmul__‘, ‘__ror__‘, ‘__rpow__‘, ‘__rrshift__‘, ‘__rshift__‘, ‘__rsub__‘, ‘__rtruediv__‘, ‘__rxor__‘, ‘__setattr__‘, ‘__sizeof__‘, ‘__str__‘, ‘__sub__‘, ‘__subclasshook__‘, ‘__truediv__‘, ‘__trunc__‘, ‘__xor__‘, ‘bit_length‘, ‘conjugate‘, ‘denominator‘, ‘imag‘, ‘numerator‘, ‘real‘]

源码

  1 class int(object):
  2     """
  3     int(x=0) -> int or long
  4     int(x, base=10) -> int or long
  5
  6     Convert a number or string to an integer, or return 0 if no arguments
  7     are given.  If x is floating point, the conversion truncates towards zero.
  8     If x is outside the integer range, the function returns a long instead.
  9
 10     If x is not a number or if base is given, then x must be a string or
 11     Unicode object representing an integer literal in the given base.  The
 12     literal can be preceded by ‘+‘ or ‘-‘ and be surrounded by whitespace.
 13     The base defaults to 10.  Valid bases are 0 and 2-36.  Base 0 means to
 14     interpret the base from the string as an integer literal.
 15     >>> int(‘0b100‘, base=0)
 16     4
 17     """
 18     def bit_length(self): # real signature unknown; restored from __doc__
 19         """返回表示该数字时所用的最小位数
 20         int.bit_length() -> int
 21
 22         Number of bits necessary to represent self in binary.
 23         >>> bin(37)
 24         ‘0b100101‘
 25         >>> (37).bit_length()
 26         6
 27         """
 28         return 0
 29
 30     def conjugate(self, *args, **kwargs): # real signature unknown
 31         """返回一个复数的共轭复数
 32          Returns self, the complex conjugate of any int. """
 33         pass
 34
 35     def __abs__(self): # real signature unknown; restored from __doc__
 36         """ 返回绝对值
 37         x.__abs__() <==> abs(x) """
 38         pass
 39
 40     def __add__(self, y): # real signature unknown; restored from __doc__
 41         """ 返回两个数的和
 42         x.__add__(y) <==> x+y """
 43         pass
 44
 45     def __and__(self, y): # real signature unknown; restored from __doc__
 46         """ 返回两个数按位与的结果
 47         x.__and__(y) <==> x&y """
 48         pass
 49
 50     def __cmp__(self, y): # real signature unknown; restored from __doc__
 51         """返回两个数比较的结果,参数从左至右(a,b),a>b返回1,a<b返回-1,a=b返回0
 52         x.__cmp__(y) <==> cmp(x,y) """
 53         pass
 54
 55     def __coerce__(self, y): # real signature unknown; restored from __doc__
 56         """a.__coerce__(b),强制返回一个元组(a,b)
 57         x.__coerce__(y) <==> coerce(x, y) """
 58         pass
 59
 60     def __divmod__(self, y): # real signature unknown; restored from __doc__
 61         """ 相除,得到商和余数组成的元组
 62         x.__divmod__(y) <==> divmod(x, y) """
 63         pass
 64
 65     def __div__(self, y): # real signature unknown; restored from __doc__
 66         """返回两数相除的商
 67         x.__div__(y) <==> x/y """
 68         pass
 69
 70     def __float__(self): # real signature unknown; restored from __doc__
 71         """将数据类型强制转换为float
 72         x.__float__() <==> float(x) """
 73         pass
 74
 75     def __floordiv__(self, y): # real signature unknown; restored from __doc__
 76         """ 不保留小数点后的小数除法,也可以用‘//’来表示:a//b,我们亲切地称之为“地板除”!!!
 77         x.__floordiv__(y) <==> x//y """
 78         pass
 79
 80     def __format__(self, *args, **kwargs): # real signature unknown
 81         """ 格式化"""
 82         pass
 83
 84     def __getattribute__(self, name): # real signature unknown; restored from __doc__
 85         """无条件被调用,通过实例访问属性
 86         x.__getattribute__(‘name‘) <==> x.name """
 87         pass
 88
 89     def __getnewargs__(self, *args, **kwargs): # real signature unknown
 90         """ 内部调用 __new__方法或创建对象时传入参数使用 """
 91         pass
 92
 93     def __hash__(self): # real signature unknown; restored from __doc__
 94         """ 如果对象object为哈希表类型,返回对象object的哈希值。哈希值为整数。在字典查找中,哈希值用于快速比较字典的键。两个数值如果相等,则哈希值也相等
 95         x.__hash__() <==> hash(x) """
 96         pass
 97
 98     def __hex__(self): # real signature unknown; restored from __doc__
 99         """ 返回当前数的 十六进制 表示
100         x.__hex__() <==> hex(x) """
101         pass
102
103     def __index__(self): # real signature unknown; restored from __doc__
104         """ 用于切片,对数字无意义
105         x[y:z] <==> x[y.__index__():z.__index__()] """
106         pass
107
108     def __init__(self, x, base=10): # known special case of int.__init__
109         """构造函数
110         int(x=0) -> int or long
111         int(x, base=10) -> int or long
112
113         Convert a number or string to an integer, or return 0 if no arguments
114         are given.  If x is floating point, the conversion truncates towards zero.
115         If x is outside the integer range, the function returns a long instead.
116
117         If x is not a number or if base is given, then x must be a string or
118         Unicode object representing an integer literal in the given base.  The
119         literal can be preceded by ‘+‘ or ‘-‘ and be surrounded by whitespace.
120         The base defaults to 10.  Valid bases are 0 and 2-36.  Base 0 means to
121         interpret the base from the string as an integer literal.
122         >>> int(‘0b100‘, base=0)
123         4
124         # (copied from class doc)
125         """
126         pass
127
128     def __int__(self): # real signature unknown; restored from __doc__
129         """ 转换为整数
130         x.__int__() <==> int(x) """
131         pass
132
133     def __invert__(self): # real signature unknown; restored from __doc__
134         """按位求反
135         x.__invert__() <==> ~x """
136         pass
137
138     def __long__(self): # real signature unknown; restored from __doc__
139         """转换为长整数
140         x.__long__() <==> long(x) """
141         pass
142
143     def __lshift__(self, y): # real signature unknown; restored from __doc__
144         """ 左移,相对二进制的操作
145         x.__lshift__(y) <==> x<<y """
146         pass
147
148     def __mod__(self, y): # real signature unknown; restored from __doc__
149         """ 取余
150         x.__mod__(y) <==> x%y """
151         pass
152
153     def __mul__(self, y): # real signature unknown; restored from __doc__
154         """ 返回两数相乘的积
155         x.__mul__(y) <==> x*y """
156         pass
157
158     def __neg__(self): # real signature unknown; restored from __doc__
159         """ 返回一个数的负数,个人觉得和相反数没差
160         x.__neg__() <==> -x """
161         pass
162
163     @staticmethod # known case of __new__
164     def __new__(S, *more): # real signature unknown; restored from __doc__
165         """ 创建一个int类的新对象
166         T.__new__(S, ...) -> a new object with type S, a subtype of T """
167         pass
168
169     def __nonzero__(self): # real signature unknown; restored from __doc__
170         """ 判断一个数是不是0
171         x.__nonzero__() <==> x != 0 """
172         pass
173
174     def __oct__(self): # real signature unknown; restored from __doc__
175         """ 返回该值的 八进制 表示
176         x.__oct__() <==> oct(x) """
177         pass
178
179     def __or__(self, y): # real signature unknown; restored from __doc__
180         """ 位运算,或,针对二进制数
181         x.__or__(y) <==> x|y """
182         pass
183
184     def __pos__(self): # real signature unknown; restored from __doc__
185         """ 并没什么卵用,说是a.__pos__(),会返回一个+a,但是不管输入整数还是负数,返回值都是他本身,感觉歪果仁真有幽默感
186         x.__pos__() <==> +x """
187         pass
188
189     def __pow__(self, y, z=None): # real signature unknown; restored from __doc__
190         """  幂,次方
191         x.__pow__(y[, z]) <==> pow(x, y[, z]) """
192         pass
193
194     def __radd__(self, y): # real signature unknown; restored from __doc__
195         """x.__radd__(y) <==> y+x """
196         pass
197
198     def __rand__(self, y): # real signature unknown; restored from __doc__
199         """x.__rand__(y) <==> y&x """
200         pass
201
202     def __rdivmod__(self, y): # real signature unknown; restored from __doc__
203         """ x.__rdivmod__(y) <==> divmod(y, x) """
204         pass
205
206     def __rdiv__(self, y): # real signature unknown; restored from __doc__
207         """ x.__rdiv__(y) <==> y/x """
208         pass
209
210     def __repr__(self): # real signature unknown; restored from __doc__
211         """ 转化为解释器可读取的形式
212         x.__repr__() <==> repr(x) """
213         pass
214
215     def __rfloordiv__(self, y): # real signature unknown; restored from __doc__
216         """
217         x.__rfloordiv__(y) <==> y//x """
218         pass
219
220     def __rlshift__(self, y): # real signature unknown; restored from __doc__
221         """ x.__rlshift__(y) <==> y<<x """
222         pass
223
224     def __rmod__(self, y): # real signature unknown; restored from __doc__
225         """ x.__rmod__(y) <==> y%x """
226         pass
227
228     def __rmul__(self, y): # real signature unknown; restored from __doc__
229         """ x.__rmul__(y) <==> y*x """
230         pass
231
232     def __ror__(self, y): # real signature unknown; restored from __doc__
233         """ x.__ror__(y) <==> y|x """
234         pass
235
236     def __rpow__(self, x, z=None): # real signature unknown; restored from __doc__
237         """ y.__rpow__(x[, z]) <==> pow(x, y[, z]) """
238         pass
239
240     def __rrshift__(self, y): # real signature unknown; restored from __doc__
241         """ x.__rrshift__(y) <==> y>>x """
242         pass
243
244     def __rshift__(self, y): # real signature unknown; restored from __doc__
245         """ x.__rshift__(y) <==> x>>y """
246         pass
247
248     def __rsub__(self, y): # real signature unknown; restored from __doc__
249         """ x.__rsub__(y) <==> y-x """
250         pass
251
252     def __rtruediv__(self, y): # real signature unknown; restored from __doc__
253         """ x.__rtruediv__(y) <==> y/x """
254         pass
255
256     def __rxor__(self, y): # real signature unknown; restored from __doc__
257         """ x.__rxor__(y) <==> y^x """
258         pass
259
260     def __str__(self): # real signature unknown; restored from __doc__
261         """ 转换为人阅读的形式,如果没有适于人阅读的解释形式的话,则返回解释器课阅读的形式
262         x.__str__() <==> str(x) """
263         pass
264
265     def __sub__(self, y): # real signature unknown; restored from __doc__
266         """ 返回两数相减的差
267         x.__sub__(y) <==> x-y """
268         pass
269
270     def __truediv__(self, y): # real signature unknown; restored from __doc__
271         """返回两数相除的商,这里的除是精确的除法,不会省略小数点后的值
272         x.__truediv__(y) <==> x/y """
273         pass
274
275     def __trunc__(self, *args, **kwargs): # real signature unknown
276         """返回数值被截取为整形的值,在整形中无意义
277        Truncating an Integral returns itself. """
278         pass
279
280     def __xor__(self, y): # real signature unknown; restored from __doc__
281         """ 按位异或
282         x.__xor__(y) <==> x^y """
283         pass
284
285     denominator = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
286      """ 分母 = 1 """
287      """the denominator of a rational number in lowest terms"""
288
289     imag = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
290     """ 虚数,无意义 """
291     """the imaginary part of a complex number"""
292
293     numerator = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
294     """ 分子 = 数字大小 """
295     """the numerator of a rational number in lowest terms"""
296
297     real = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
298     """ 实数,无意义 """
299     """the real part of a complex number"""
300
301 int Code

只是在前面多了一个‘r‘的比如and,变成了rand,在这里统一总结,就是参数的顺序从右到左反过来了。比如原本的a.__div__(b)是a/b,但是a.__rdiv__(b)的表示的就是b/a。

在int类中,常用的方法:

(1)__cmp__:比较两个数的大小

(2)__neg__/__ads__;去相反数、取绝对值

a = -13
b = 20
n = a.__neg__()
print(n)

m = b.__neg__()
print(m)

k = a.__abs__()
print(k)

h = b.__abs__()
print(h)
输出:
13
-20
13
20

(3)__divmod__;返回两个数相除的商和余数组成的元组(商,余数) 应用:显示数据分页

a = 102
b = 10
n = a.__divmod__(b)
print(n)
输出
(10,2)

long类(长整形)

所有方法:

>>> dir(long)
[‘__abs__‘, ‘__add__‘, ‘__and__‘, ‘__class__‘, ‘__cmp__‘, ‘__coerce__‘, ‘__delattr__‘, ‘__div__‘, ‘__divmod__‘, ‘__doc__‘, ‘__float__‘, ‘__floordiv__‘, ‘__format__‘, ‘__getattribute__‘, ‘__getnewargs__‘, ‘__hash__‘, ‘__hex__‘, ‘__index__‘, ‘__init__‘, ‘__int__‘, ‘__invert__‘, ‘__long__‘, ‘__lshift__‘, ‘__mod__‘, ‘__mul__‘, ‘__neg__‘, ‘__new__‘, ‘__nonzero__‘, ‘__oct__‘, ‘__or__‘, ‘__pos__‘, ‘__pow__‘, ‘__radd__‘, ‘__rand__‘, ‘__rdiv__‘, ‘__rdivmod__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__rfloordiv__‘, ‘__rlshift__‘, ‘__rmod__‘, ‘__rmul__‘, ‘__ror__‘, ‘__rpow__‘, ‘__rrshift__‘, ‘__rshift__‘, ‘__rsub__‘, ‘__rtruediv__‘, ‘__rxor__‘, ‘__setattr__‘, ‘__sizeof__‘, ‘__str__‘, ‘__sub__‘, ‘__subclasshook__‘, ‘__truediv__‘, ‘__trunc__‘, ‘__xor__‘, ‘bit_length‘, ‘conjugate‘, ‘denominator‘, ‘imag‘, ‘numerator‘, ‘real‘]

fioat类(浮点型)

所有方法:

>>> dir(float)
[‘__abs__‘, ‘__add__‘, ‘__class__‘, ‘__coerce__‘, ‘__delattr__‘, ‘__div__‘, ‘__divmod__‘, ‘__doc__‘, ‘__eq__‘, ‘__float__‘, ‘__floordiv__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getformat__‘, ‘__getnewargs__‘, ‘__gt__‘, ‘__hash__‘, ‘__init__‘, ‘__int__‘, ‘__le__‘, ‘__long__‘, ‘__lt__‘, ‘__mod__‘, ‘__mul__‘, ‘__ne__‘, ‘__neg__‘, ‘__new__‘, ‘__nonzero__‘, ‘__pos__‘, ‘__pow__‘, ‘__radd__‘, ‘__rdiv__‘, ‘__rdivmod__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__rfloordiv__‘, ‘__rmod__‘, ‘__rmul__‘, ‘__rpow__‘, ‘__rsub__‘, ‘__rtruediv__‘, ‘__setattr__‘, ‘__setformat__‘, ‘__sizeof__‘, ‘__str__‘, ‘__sub__‘, ‘__subclasshook__‘, ‘__truediv__‘, ‘__trunc__‘, ‘as_integer_ratio‘, ‘conjugate‘, ‘fromhex‘, ‘hex‘, ‘imag‘, ‘is_integer‘, ‘real‘]

str类(字符串)

所有方法

>>> dir(str)
[‘__add__‘, ‘__class__‘, ‘__contains__‘, ‘__delattr__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘__getnewargs__‘, ‘__getslice__‘, ‘__gt__‘, ‘__hash__‘, ‘__init__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__mod__‘, ‘__mul__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__rmod__‘, ‘__rmul__‘, ‘__setattr__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘_formatter_field_name_split‘, ‘_formatter_parser‘, ‘capitalize‘, ‘center‘, ‘count‘, ‘decode‘, ‘encode‘, ‘endswith‘, ‘expandtabs‘, ‘find‘, ‘format‘, ‘index‘, ‘isalnum‘, ‘isalpha‘, ‘isdigit‘, ‘islower‘, ‘isspace‘, ‘istitle‘, ‘isupper‘, ‘join‘, ‘ljust‘, ‘lower‘, ‘lstrip‘, ‘partition‘, ‘replace‘, ‘rfind‘, ‘rindex‘, ‘rjust‘, ‘rpartition‘, ‘rsplit‘, ‘rstrip‘, ‘split‘, ‘splitlines‘, ‘startswith‘, ‘strip‘, ‘swapcase‘, ‘title‘, ‘translate‘, ‘upper‘, ‘zfill‘]

源码

class str(basestring):
    """
    str(object=‘‘) -> string

    Return a nice string representation of the object.
    If the argument is a string, the return value is the same object.
    """
    def capitalize(self):
        """ 首字母变大写 """
        """
        S.capitalize() -> string

        Return a copy of the string S with only its first character
        capitalized.
        """
        return ""

    def center(self, width, fillchar=None):
        """ 内容居中,width:总长度;fillchar:空白处填充内容,默认无 """
        """
        S.center(width[, fillchar]) -> string

        Return S centered in a string of length width. Padding is
        done using the specified fill character (default is a space)
        """
        return ""

    def count(self, sub, start=None, end=None):
        """ 子序列个数 """
        """
        S.count(sub[, start[, end]]) -> int

        Return the number of non-overlapping occurrences of substring sub in
        string S[start:end].  Optional arguments start and end are interpreted
        as in slice notation.
        """
        return 0

    def decode(self, encoding=None, errors=None):
        """ 解码 """
        """
        S.decode([encoding[,errors]]) -> object

        Decodes S using the codec registered for encoding. encoding defaults
        to the default encoding. errors may be given to set a different error
        handling scheme. Default is ‘strict‘ meaning that encoding errors raise
        a UnicodeDecodeError. Other possible values are ‘ignore‘ and ‘replace‘
        as well as any other name registered with codecs.register_error that is
        able to handle UnicodeDecodeErrors.
        """
        return object()

    def encode(self, encoding=None, errors=None):
        """ 编码,针对unicode """
        """
        S.encode([encoding[,errors]]) -> object

        Encodes S using the codec registered for encoding. encoding defaults
        to the default encoding. errors may be given to set a different error
        handling scheme. Default is ‘strict‘ meaning that encoding errors raise
        a UnicodeEncodeError. Other possible values are ‘ignore‘, ‘replace‘ and
        ‘xmlcharrefreplace‘ as well as any other name registered with
        codecs.register_error that is able to handle UnicodeEncodeErrors.
        """
        return object()

    def endswith(self, suffix, start=None, end=None):
        """ 是否以 xxx 结束 """
        """
        S.endswith(suffix[, start[, end]]) -> bool

        Return True if S ends with the specified suffix, False otherwise.
        With optional start, test S beginning at that position.
        With optional end, stop comparing S at that position.
        suffix can also be a tuple of strings to try.
        """
        return False

    def expandtabs(self, tabsize=None):
        """ 将tab转换成空格,默认一个tab转换成8个空格 """
        """
        S.expandtabs([tabsize]) -> string

        Return a copy of S where all tab characters are expanded using spaces.
        If tabsize is not given, a tab size of 8 characters is assumed.
        """
        return ""

    def find(self, sub, start=None, end=None):
        """ 寻找子序列位置,如果没找到,则异常 """
        """
        S.find(sub [,start [,end]]) -> int

        Return the lowest index in S where substring sub is found,
        such that sub is contained within S[start:end].  Optional
        arguments start and end are interpreted as in slice notation.

        Return -1 on failure.
        """
        return 0

    def format(*args, **kwargs): # known special case of str.format
        """ 字符串格式化,动态参数,将函数式编程时细说 """
        """
        S.format(*args, **kwargs) -> string

        Return a formatted version of S, using substitutions from args and kwargs.
        The substitutions are identified by braces (‘{‘ and ‘}‘).
        """
        pass

    def index(self, sub, start=None, end=None):
        """ 子序列位置,如果没找到,则返回-1  """
        S.index(sub [,start [,end]]) -> int

        Like S.find() but raise ValueError when the substring is not found.
        """
        return 0

    def isalnum(self):
        """ 是否是字母和数字 """
        """
        S.isalnum() -> bool

        Return True if all characters in S are alphanumeric
        and there is at least one character in S, False otherwise.
        """
        return False

    def isalpha(self):
        """ 是否是字母 """
        """
        S.isalpha() -> bool

        Return True if all characters in S are alphabetic
        and there is at least one character in S, False otherwise.
        """
        return False

    def isdigit(self):
        """ 是否是数字 """
        """
        S.isdigit() -> bool

        Return True if all characters in S are digits
        and there is at least one character in S, False otherwise.
        """
        return False

    def islower(self):
        """ 是否小写 """
        """
        S.islower() -> bool

        Return True if all cased characters in S are lowercase and there is
        at least one cased character in S, False otherwise.
        """
        return False

    def isspace(self):
        """是否空格
        S.isspace() -> bool

        Return True if all characters in S are whitespace
        and there is at least one character in S, False otherwise.
        """
        return False

    def istitle(self):
        """是否标题
        S.istitle() -> bool

        Return True if S is a titlecased string and there is at least one
        character in S, i.e. uppercase characters may only follow uncased
        characters and lowercase characters only cased ones. Return False
        otherwise.
        """
        return False

    def isupper(self):
        """是否大写
        S.isupper() -> bool

        Return True if all cased characters in S are uppercase and there is
        at least one cased character in S, False otherwise.
        """
        return False

    def join(self, iterable):
        """ 连接 """
        """
        S.join(iterable) -> string

        Return a string which is the concatenation of the strings in the
        iterable.  The separator between elements is S.
        """
        return ""

    def ljust(self, width, fillchar=None):
        """ 内容左对齐,右侧填充 """
        """
        S.ljust(width[, fillchar]) -> string

        Return S left-justified in a string of length width. Padding is
        done using the specified fill character (default is a space).
        """
        return ""

    def lower(self):
        """ 变小写 """
        """
        S.lower() -> string

        Return a copy of the string S converted to lowercase.
        """
        return ""

    def lstrip(self, chars=None):
        """ 移除左侧空白 """
        """
        S.lstrip([chars]) -> string or unicode

        Return a copy of the string S with leading whitespace removed.
        If chars is given and not None, remove characters in chars instead.
        If chars is unicode, S will be converted to unicode before stripping
        """
        return ""

    def partition(self, sep):
        """ 分割,前,中,后三部分 """
        """
        S.partition(sep) -> (head, sep, tail)

        Search for the separator sep in S, and return the part before it,
        the separator itself, and the part after it.  If the separator is not
        found, return S and two empty strings.
        """
        pass

    def replace(self, old, new, count=None):
        """ 替换 """
        """
        S.replace(old, new[, count]) -> string

        Return a copy of string S with all occurrences of substring
        old replaced by new.  If the optional argument count is
        given, only the first count occurrences are replaced.
        """
        return ""

    def rfind(self, sub, start=None, end=None):
        """
        S.rfind(sub [,start [,end]]) -> int

        Return the highest index in S where substring sub is found,
        such that sub is contained within S[start:end].  Optional
        arguments start and end are interpreted as in slice notation.

        Return -1 on failure.
        """
        return 0

    def rindex(self, sub, start=None, end=None):
        """
        S.rindex(sub [,start [,end]]) -> int

        Like S.rfind() but raise ValueError when the substring is not found.
        """
        return 0

    def rjust(self, width, fillchar=None):
        """
        S.rjust(width[, fillchar]) -> string

        Return S right-justified in a string of length width. Padding is
        done using the specified fill character (default is a space)
        """
        return ""

    def rpartition(self, sep):
        """
        S.rpartition(sep) -> (head, sep, tail)

        Search for the separator sep in S, starting at the end of S, and return
        the part before it, the separator itself, and the part after it.  If the
        separator is not found, return two empty strings and S.
        """
        pass

    def rsplit(self, sep=None, maxsplit=None):
        """
        S.rsplit([sep [,maxsplit]]) -> list of strings

        Return a list of the words in the string S, using sep as the
        delimiter string, starting at the end of the string and working
        to the front.  If maxsplit is given, at most maxsplit splits are
        done. If sep is not specified or is None, any whitespace string
        is a separator.
        """
        return []

    def rstrip(self, chars=None):
        """
        S.rstrip([chars]) -> string or unicode

        Return a copy of the string S with trailing whitespace removed.
        If chars is given and not None, remove characters in chars instead.
        If chars is unicode, S will be converted to unicode before stripping
        """
        return ""

    def split(self, sep=None, maxsplit=None):
        """ 分割, maxsplit最多分割几次 """
        """
        S.split([sep [,maxsplit]]) -> list of strings

        Return a list of the words in the string S, using sep as the
        delimiter string.  If maxsplit is given, at most maxsplit
        splits are done. If sep is not specified or is None, any
        whitespace string is a separator and empty strings are removed
        from the result.
        """
        return []

    def splitlines(self, keepends=False):
        """ 根据换行分割 """
        """
        S.splitlines(keepends=False) -> list of strings

        Return a list of the lines in S, breaking at line boundaries.
        Line breaks are not included in the resulting list unless keepends
        is given and true.
        """
        return []

    def startswith(self, prefix, start=None, end=None):
        """ 是否起始 """
        """
        S.startswith(prefix[, start[, end]]) -> bool

        Return True if S starts with the specified prefix, False otherwise.
        With optional start, test S beginning at that position.
        With optional end, stop comparing S at that position.
        prefix can also be a tuple of strings to try.
        """
        return False

    def strip(self, chars=None):
        """ 移除两段空白 """
        """
        S.strip([chars]) -> string or unicode

        Return a copy of the string S with leading and trailing
        whitespace removed.
        If chars is given and not None, remove characters in chars instead.
        If chars is unicode, S will be converted to unicode before stripping
        """
        return ""

    def swapcase(self):
        """ 大写变小写,小写变大写 """
        """
        S.swapcase() -> string

        Return a copy of the string S with uppercase characters
        converted to lowercase and vice versa.
        """
        return ""

    def title(self):
        """
        S.title() -> string

        Return a titlecased version of S, i.e. words start with uppercase
        characters, all remaining cased characters have lowercase.
        """
        return ""

    def translate(self, table, deletechars=None):
        """
        转换,需要先做一个对应表,最后一个表示删除字符集合
        intab = "aeiou"
        outtab = "12345"
        trantab = maketrans(intab, outtab)
        str = "this is string example....wow!!!"
        print str.translate(trantab, ‘xm‘)
        """

        """
        S.translate(table [,deletechars]) -> string

        Return a copy of the string S, where all characters occurring
        in the optional argument deletechars are removed, and the
        remaining characters have been mapped through the given
        translation table, which must be a string of length 256 or None.
        If the table argument is None, no translation is applied and
        the operation simply removes the characters in deletechars.
        """
        return ""

    def upper(self):
        """
        S.upper() -> string

        Return a copy of the string S converted to uppercase.
        """
        return ""

    def zfill(self, width):
        """方法返回指定长度的字符串,原字符串右对齐,前面填充0。"""
        """
        S.zfill(width) -> string

        Pad a numeric string S with zeros on the left, to fill a field
        of the specified width.  The string S is never truncated.
        """
        return ""

    def _formatter_field_name_split(self, *args, **kwargs): # real signature unknown
        pass

    def _formatter_parser(self, *args, **kwargs): # real signature unknown
        pass

    def __add__(self, y):
        """ x.__add__(y) <==> x+y """
        pass

    def __contains__(self, y):
        """ x.__contains__(y) <==> y in x """
        pass

    def __eq__(self, y):
        """ x.__eq__(y) <==> x==y """
        pass

    def __format__(self, format_spec):
        """
        S.__format__(format_spec) -> string

        Return a formatted version of S as described by format_spec.
        """
        return ""

    def __getattribute__(self, name):
        """ x.__getattribute__(‘name‘) <==> x.name """
        pass

    def __getitem__(self, y):
        """ x.__getitem__(y) <==> x[y] """
        pass

    def __getnewargs__(self, *args, **kwargs): # real signature unknown
        pass

    def __getslice__(self, i, j):
        """
        x.__getslice__(i, j) <==> x[i:j]

                   Use of negative indices is not supported.
        """
        pass

    def __ge__(self, y):
        """ x.__ge__(y) <==> x>=y """
        pass

    def __gt__(self, y):
        """ x.__gt__(y) <==> x>y """
        pass

    def __hash__(self):
        """ x.__hash__() <==> hash(x) """
        pass

    def __init__(self, string=‘‘): # known special case of str.__init__
        """
        str(object=‘‘) -> string

        Return a nice string representation of the object.
        If the argument is a string, the return value is the same object.
        # (copied from class doc)
        """
        pass

    def __len__(self):
        """ x.__len__() <==> len(x) """
        pass

    def __le__(self, y):
        """ x.__le__(y) <==> x<=y """
        pass

    def __lt__(self, y):
        """ x.__lt__(y) <==> x<y """
        pass

    def __mod__(self, y):
        """ x.__mod__(y) <==> x%y """
        pass

    def __mul__(self, n):
        """ x.__mul__(n) <==> x*n """
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more):
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __ne__(self, y):
        """ x.__ne__(y) <==> x!=y """
        pass

    def __repr__(self):
        """ x.__repr__() <==> repr(x) """
        pass

    def __rmod__(self, y):
        """ x.__rmod__(y) <==> y%x """
        pass

    def __rmul__(self, n):
        """ x.__rmul__(n) <==> n*x """
        pass

    def __sizeof__(self):
        """ S.__sizeof__() -> size of S in memory, in bytes """
        pass

    def __str__(self):
        """ x.__str__() <==> str(x) """
        pass

str

str Code

str类中常见的方法实例:

(1)capitalize:将首字母大写

a1 = "alex"
ret = a1.capitalize()
print(ret)

(2)center/ljust/rjust:固定字符串长度,居中/居左/居右

a1 = "alex"
ret = a1.center(10,"*")
print(ret)

a1 = "alex"
ret = a1.ljust(10,"*")
print(ret)

a1 = "alex"
ret = a1.rjust(10,"*")
print(ret)
输出
***alex***
alex******
******alex

(3)count:子序列个数,用来统计一个字符串中包含子序列的个数。

str1 = ‘hello,Eva.Have a nice day‘
r = str1.count("a")
print(r)
输出
4

(4)encode/decode:编码/解码

(5)endswith:是否以...(子串)结尾。这里的子串依然可以是一个或多个字符。

str1 = ‘hello,Eva.Have a nice day‘
r = str1.endswith("day")
print(r)
输出
True

(6)expandtabs:将tab转换成空格,默认一个tab转换成8个空格。

name = "    Eva"
b = name.expandtabs()
print(b)

(7)find:返回字符串中第一个子序列的下标。

      rfind:和find用法一样,只是它是从右向左查找

          index:和find的左右一致,只是find找不到的时候会返回-1,而index找不到的时候会报错

(8)format:各种格式化,动态参数。

s = "hello {0}, age {1}"
new1 = s.format("alex", 19)
print(new1)
输出
hello alex, age 19

(9)isalnum/isalpha/isdigit/isspace/islower/istitle/isupper:是否是字母或数字/是否字母/是否数字/是否空格/是否小写/是否标题/是否全大写,总之都是一些判断的方        法,返回的不是True就是False。

(10)partition/split:这两个方法都用来分割。

  partition会将指定的子串串提取并将子串两侧内容分割,只匹配一次,并返回元祖;

  split会根据指定子串,将整个字符串所有匹配的子串匹配到并剔除,将其他内容分割,返回数组。

food = "apple,banana,chocolate"
d = food.split(",")
print(d)

s = food.partition(",")
print(s)
输出
[‘apple‘, ‘banana‘, ‘chocolate‘]
(‘apple‘, ‘,‘, ‘banana,chocolate‘)

(11)replace:替换。会替换字符串中所有符合条件的子串

str1 = ‘I\‘m Rita,Do you remember,Rita?‘
z = str1.replace(‘Rita‘,‘Eva‘)
print(z)
输出
I‘m Eva,Do you remember,Eva?

(12)swapcase:大写变小写,小写变大写

str1 = ‘I\‘m Rita,Do you remember,Rita?‘
z = str1.swapcase()
print(z)
输出
i‘M rITA,dO YOU REMEMBER,rITA?

list类  (列表)

所有方法

 >>> dir(list)
[‘__add__‘, ‘__class__‘, ‘__contains__‘, ‘__delattr__‘, ‘__delitem__‘, ‘__delslice__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘__getslice__‘, ‘__gt__‘, ‘__hash__‘, ‘__iadd__‘, ‘__imul__‘, ‘__init__‘, ‘__iter__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__mul__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__reversed__‘, ‘__rmul__‘, ‘__setattr__‘, ‘__setitem__‘, ‘__setslice__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘append‘, ‘count‘, ‘extend‘, ‘index‘, ‘insert‘, ‘pop‘, ‘remove‘, ‘reverse‘, ‘sort‘]

源码

class list(object):
    """
    list() -> new empty list
    list(iterable) -> new list initialized from iterable‘s items
    """在数组的末尾新增一项
    def append(self, p_object): # real signature unknown; restored from __doc__
        """
        L.append(object) -- append object to end """
        pass

    def count(self, value): # real signature unknown; restored from __doc__
        """ 查看lst中某一项出现的次数
        L.count(value) -> integer -- return number of occurrences of value """
        return 0

    def extend(self, iterable): # real signature unknown; restored from __doc__
        """将原列表与其他列表扩展成新列表
        L.extend(iterable) -- extend list by appending elements from the iterable """
        pass

    def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__
        """返回列表中第一个匹配项的下标,找不到会报错
        L.index(value, [start, [stop]]) -> integer -- return first index of value.
        Raises ValueError if the value is not present.
        """
        return 0

    def insert(self, index, p_object): # real signature unknown; restored from __doc__
        """在指定位置插入项
        L.insert(index, object) -- insert object before index """
        pass

    def pop(self, index=None): # real signature unknown; restored from __doc__
        """返回指定位置的值,并将其从列表中删除。默认对末尾项操作
        L.pop([index]) -> item -- remove and return item at index (default last).
        Raises IndexError if list is empty or index is out of range.
        """
        pass

    def remove(self, value): # real signature unknown; restored from __doc__
        """从列表中移除第一个符合与指定值相等的项
        L.remove(value) -- remove first occurrence of value.
        Raises ValueError if the value is not present.
        """
        pass

    def reverse(self): # real signature unknown; restored from __doc__
        """列表反转
        L.reverse() -- reverse *IN PLACE* """
        pass

    def sort(self, cmp=None, key=None, reverse=False): # real signature unknown; restored from __doc__
        """排序,数字、字符串按照ASCII,中文按照unicode从小到大排序。
        L.sort(cmp=None, key=None, reverse=False) -- stable sort *IN PLACE*;
        cmp(x, y) -> -1, 0, 1
        """
        pass

    def __add__(self, y): # real signature unknown; restored from __doc__
        """ 字符串拼接
        x.__add__(y) <==> x+y """
        pass

    def __contains__(self, y): # real signature unknown; restored from __doc__
        """ 判断列表中是否包含某一项
        x.__contains__(y) <==> y in x """
        pass

    def __delitem__(self, y): # real signature unknown; restored from __doc__
        """删除列表中指定下标的项
        x.__delitem__(y) <==> del x[y] """
        pass

    def __delslice__(self, i, j): # real signature unknown; restored from __doc__
        """删除指定下标之间的内容,向下包含
        x.__delslice__(i, j) <==> del x[i:j]

                   Use of negative indices is not supported.
        """
        pass

    def __eq__(self, y): # real signature unknown; restored from __doc__
        """ 判断两个列表是否相等
        x.__eq__(y) <==> x==y """
        pass

    def __getattribute__(self, name): # real signature unknown; restored from __doc__
        """ 无条件被调用,通过实例访问属性。
        x.__getattribute__(‘name‘) <==> x.name """
        pass

    def __getitem__(self, y): # real signature unknown; restored from __doc__
        """ x.__getitem__(y) <==> x[y] """
        pass

    def __getslice__(self, i, j): # real signature unknown; restored from __doc__
        """
        x.__getslice__(i, j) <==> x[i:j]

                   Use of negative indices is not supported.
        """
        pass

    def __ge__(self, y): # real signature unknown; restored from __doc__
        """ x.__ge__(y) <==> x>=y """
        pass

    def __gt__(self, y): # real signature unknown; restored from __doc__
        """ x.__gt__(y) <==> x>y """
        pass

    def __iadd__(self, y): # real signature unknown; restored from __doc__
        """ x.__iadd__(y) <==> x+=y """
        pass

    def __imul__(self, y): # real signature unknown; restored from __doc__
        """
        x.__imul__(y) <==> x*=y """
        pass

    def __init__(self, seq=()): # known special case of list.__init__
        """
        list() -> new empty list
        list(iterable) -> new list initialized from iterable‘s items
        # (copied from class doc)
        """
        pass

    def __iter__(self): # real signature unknown; restored from __doc__
        """ x.__iter__() <==> iter(x) """
        pass

    def __len__(self): # real signature unknown; restored from __doc__
        """ x.__len__() <==> len(x) """
        pass

    def __le__(self, y): # real signature unknown; restored from __doc__
        """ x.__le__(y) <==> x<=y """
        pass

    def __lt__(self, y): # real signature unknown; restored from __doc__
        """ x.__lt__(y) <==> x<y """
        pass

    def __mul__(self, n): # real signature unknown; restored from __doc__
        """ x.__mul__(n) <==> x*n """
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more): # real signature unknown; restored from __doc__
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __ne__(self, y): # real signature unknown; restored from __doc__
        """ x.__ne__(y) <==> x!=y """
        pass

    def __repr__(self): # real signature unknown; restored from __doc__
        """ x.__repr__() <==> repr(x) """
        pass

    def __reversed__(self): # real signature unknown; restored from __doc__
        """ L.__reversed__() -- return a reverse iterator over the list """
        pass

    def __rmul__(self, n): # real signature unknown; restored from __doc__
        """ x.__rmul__(n) <==> n*x """
        pass

    def __setitem__(self, i, y): # real signature unknown; restored from __doc__
        """ x.__setitem__(i, y) <==> x[i]=y """
        pass

    def __setslice__(self, i, j, y): # real signature unknown; restored from __doc__
        """
        x.__setslice__(i, j, y) <==> x[i:j]=y

                   Use  of negative indices is not supported.
        """
        pass

    def __sizeof__(self): # real signature unknown; restored from __doc__
        """ L.__sizeof__() -- size of L in memory, in bytes """
        pass

    __hash__ = None

list         

list Code

一般常用的list类的方法

(1)append:向列表中添加项

       insert:在列表的指定位置加入值

     extend:列表的扩展;

name_list = ["eirc","alex","tony"]
name_list.append(‘seven‘)
print(name_list)
# 运算结果:
# [‘eirc‘, ‘alex‘, ‘tony‘, ‘seven‘]

name_list.insert(1,‘hello‘)
print(name_list)
# 运算结果:
# [‘eirc‘, ‘hello‘, ‘alex‘, ‘tony‘, 11, 22, 33, 44]
name_list = ["eirc","alex","tony"]temp = [11,22,33,44]name_list.extend(temp)print(name_list)输出[‘eirc‘, ‘alex‘, ‘tony‘, 11, 22, 33, 44]

2)index:返回列表中第一个匹配项的下标

           __contain__:查看列表中是否包含某一项

       count:查看列表中某一项出现的次数

name_list = ["eirc","alex","tony"]
temp = [11,22,33,44]
name_list.extend(temp)
print(name_list.index(‘alex‘))
运算结果:
1

3)pop:删除并返回指定下标的值,默认为列表的最后一个值

       remove:删除列表中与指定值匹配的第一个值

__delitem__:删除指定下标的值

      __delslice__:删除指定下标区域内的所有值,下标向下包含

name_list = ["eirc","alex","tony"]
a1 = name_list.pop()
print(a1)

name_list = [‘eirc‘, ‘hello‘,‘alex‘, ‘alex‘, ‘tony‘]
name_list.remove(‘alex‘)
print(name_list)
输出
tony
[‘eirc‘, ‘hello‘, ‘alex‘, ‘tony‘, 11, 22, 33, 44]

(4)reverse:列表反转,这个反转并没有什么编码顺序,就是单纯的把原来的列表从头到尾调转过来而已。
   sort:排序,数字、字符串按照ASCII,中文按照unicode从小到大排序。

name_list = [‘eirc‘, ‘hello‘,‘alex‘, ‘alex‘, ‘tony‘]
name_list.reverse()
print(name_list)

name_list = [11,44,55,66,77,99,33]
name_list.sort()
print(name_list)
输出
[‘tony‘, ‘alex‘, ‘alex‘, ‘hello‘, ‘eirc‘]
[11, 33, 44, 55, 66, 77, 99]

tupie类(元组)

所有方法

>>> dir(tuple)
[‘__add__‘, ‘__class__‘, ‘__contains__‘, ‘__delattr__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘__getnewargs__‘, ‘__getslice__‘, ‘__gt__‘, ‘__hash__‘, ‘__init__‘, ‘__iter__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__mul__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__rmul__‘, ‘__setattr__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘count‘, ‘index‘]

tuple和list基本相同,但是tuple是不可修改的。所以也就没有添加,删除,修改等方法。但是count,__contain__等方法还是存在的,和list中用法相同

dict类(字典)

所有方法

dir(dict)
[‘__class__‘, ‘__cmp__‘, ‘__contains__‘, ‘__delattr__‘, ‘__delitem__‘, ‘__doc__‘, ‘__eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__getitem__‘, ‘__gt__‘, ‘__hash__‘, ‘__init__‘, ‘__iter__‘, ‘__le__‘, ‘__len__‘, ‘__lt__‘, ‘__ne__‘, ‘__new__‘, ‘__reduce__‘, ‘__reduce_ex__‘, ‘__repr__‘, ‘__setattr__‘, ‘__setitem__‘, ‘__sizeof__‘, ‘__str__‘, ‘__subclasshook__‘, ‘clear‘, ‘copy‘, ‘fromkeys‘, ‘get‘, ‘has_key‘, ‘items‘, ‘iteritems‘, ‘iterkeys‘, ‘itervalues‘, ‘keys‘, ‘pop‘, ‘popitem‘, ‘setdefault‘, ‘update‘, ‘values‘, ‘viewitems‘, ‘viewkeys‘, ‘viewvalues‘]

源码

class dict(object):
    """
    dict() -> new empty dictionary
    dict(mapping) -> new dictionary initialized from a mapping object‘s
        (key, value) pairs
    dict(iterable) -> new dictionary initialized as if via:
        d = {}
        for k, v in iterable:
            d[k] = v
    dict(**kwargs) -> new dictionary initialized with the name=value pairs
        in the keyword argument list.  For example:  dict(one=1, two=2)
    """

    def clear(self): # real signature unknown; restored from __doc__
        """ 清除内容 """
        """ D.clear() -> None.  Remove all items from D. """
        pass

    def copy(self): # real signature unknown; restored from __doc__
        """ 浅拷贝 """
        """ D.copy() -> a shallow copy of D """
        pass

    @staticmethod # known case
    def fromkeys(S, v=None): # real signature unknown; restored from __doc__
        """
        dict.fromkeys(S[,v]) -> New dict with keys from S and values equal to v.
        v defaults to None.
        """
        pass

    def get(self, k, d=None): # real signature unknown; restored from __doc__
        """ 根据key获取值,d是默认值 """
        """ D.get(k[,d]) -> D[k] if k in D, else d.  d defaults to None. """
        pass

    def has_key(self, k): # real signature unknown; restored from __doc__
        """ 是否有key """
        """ D.has_key(k) -> True if D has a key k, else False """
        return False

    def items(self): # real signature unknown; restored from __doc__
        """ 所有项的列表形式 """
        """ D.items() -> list of D‘s (key, value) pairs, as 2-tuples """
        return []

    def iteritems(self): # real signature unknown; restored from __doc__
        """ 项可迭代 """
        """ D.iteritems() -> an iterator over the (key, value) items of D """
        pass

    def iterkeys(self): # real signature unknown; restored from __doc__
        """ key可迭代 """
        """ D.iterkeys() -> an iterator over the keys of D """
        pass

    def itervalues(self): # real signature unknown; restored from __doc__
        """ value可迭代 """
        """ D.itervalues() -> an iterator over the values of D """
        pass

    def keys(self): # real signature unknown; restored from __doc__
        """ 所有的key列表 """
        """ D.keys() -> list of D‘s keys """
        return []

    def pop(self, k, d=None): # real signature unknown; restored from __doc__
        """ 获取并在字典中移除 """
        """
        D.pop(k[,d]) -> v, remove specified key and return the corresponding value.
        If key is not found, d is returned if given, otherwise KeyError is raised
        """
        pass

    def popitem(self): # real signature unknown; restored from __doc__
        """ 获取并在字典中移除 """
        """
        D.popitem() -> (k, v), remove and return some (key, value) pair as a
        2-tuple; but raise KeyError if D is empty.
        """
        pass

    def setdefault(self, k, d=None): # real signature unknown; restored from __doc__
        """ 如果key不存在,则创建,如果存在,则返回已存在的值且不修改 """
        """ D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D """
        pass

    def update(self, E=None, **F): # known special case of dict.update
        """ 更新
            {‘name‘:‘alex‘, ‘age‘: 18000}
            [(‘name‘,‘sbsbsb‘),]
        """
        """
        D.update([E, ]**F) -> None.  Update D from dict/iterable E and F.
        If E present and has a .keys() method, does:     for k in E: D[k] = E[k]
        If E present and lacks .keys() method, does:     for (k, v) in E: D[k] = v
        In either case, this is followed by: for k in F: D[k] = F[k]
        """
        pass

    def values(self): # real signature unknown; restored from __doc__
        """ 所有的值 """
        """ D.values() -> list of D‘s values """
        return []

    def viewitems(self): # real signature unknown; restored from __doc__
        """ 所有项,只是将内容保存至view对象中 """
        """ D.viewitems() -> a set-like object providing a view on D‘s items """
        pass

    def viewkeys(self): # real signature unknown; restored from __doc__
        """ D.viewkeys() -> a set-like object providing a view on D‘s keys """
        pass

    def viewvalues(self): # real signature unknown; restored from __doc__
        """ D.viewvalues() -> an object providing a view on D‘s values """
        pass

    def __cmp__(self, y): # real signature unknown; restored from __doc__
        """ x.__cmp__(y) <==> cmp(x,y) """
        pass

    def __contains__(self, k): # real signature unknown; restored from __doc__
        """ D.__contains__(k) -> True if D has a key k, else False """
        return False

    def __delitem__(self, y): # real signature unknown; restored from __doc__
        """ x.__delitem__(y) <==> del x[y] """
        pass

    def __eq__(self, y): # real signature unknown; restored from __doc__
        """ x.__eq__(y) <==> x==y """
        pass

    def __getattribute__(self, name): # real signature unknown; restored from __doc__
        """ x.__getattribute__(‘name‘) <==> x.name """
        pass

    def __getitem__(self, y): # real signature unknown; restored from __doc__
        """ x.__getitem__(y) <==> x[y] """
        pass

    def __ge__(self, y): # real signature unknown; restored from __doc__
        """ x.__ge__(y) <==> x>=y """
        pass

    def __gt__(self, y): # real signature unknown; restored from __doc__
        """ x.__gt__(y) <==> x>y """
        pass

    def __init__(self, seq=None, **kwargs): # known special case of dict.__init__
        """
        dict() -> new empty dictionary
        dict(mapping) -> new dictionary initialized from a mapping object‘s
            (key, value) pairs
        dict(iterable) -> new dictionary initialized as if via:
            d = {}
            for k, v in iterable:
                d[k] = v
        dict(**kwargs) -> new dictionary initialized with the name=value pairs
            in the keyword argument list.  For example:  dict(one=1, two=2)
        # (copied from class doc)
        """
        pass

    def __iter__(self): # real signature unknown; restored from __doc__
        """ x.__iter__() <==> iter(x) """
        pass

    def __len__(self): # real signature unknown; restored from __doc__
        """ x.__len__() <==> len(x) """
        pass

    def __le__(self, y): # real signature unknown; restored from __doc__
        """ x.__le__(y) <==> x<=y """
        pass

    def __lt__(self, y): # real signature unknown; restored from __doc__
        """ x.__lt__(y) <==> x<y """
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more): # real signature unknown; restored from __doc__
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __ne__(self, y): # real signature unknown; restored from __doc__
        """ x.__ne__(y) <==> x!=y """
        pass

    def __repr__(self): # real signature unknown; restored from __doc__
        """ x.__repr__() <==> repr(x) """
        pass

    def __setitem__(self, i, y): # real signature unknown; restored from __doc__
        """ x.__setitem__(i, y) <==> x[i]=y """
        pass

    def __sizeof__(self): # real signature unknown; restored from __doc__
        """ D.__sizeof__() -> size of D in memory, in bytes """
        pass

    __hash__ = None

dict

dict code

字典的特性,和list不同,字典是无序的,它依靠key和value之间的联系进行索引,由于这种特殊的索引方式,字典中不可以有重复的key。

一些常用的dict方法

(1)keys/values/items:取所有字典的key/取所有字典的value/取所有字典的key,value

dic = {‘name‘:‘eva‘,‘age‘:20}
print(dic.keys())
print(dic.values())
print(dic.items())
输出
dict_keys([‘name‘, ‘age‘])
dict_values([‘eva‘, 20])
dict_items([(‘name‘, ‘eva‘), (‘age‘, 20)])

(2)已知key的情况下,获取value的值时可以使用‘字典名[key值]’的方法,for k,v in dic.items()的方法

get:字典名[key值]的方式有一点弊端,那就是当key值不存在的时候会报错,这个时候我们使用get方法,可以避免报错的情况

dic = {‘name‘:‘Eva‘,‘age‘:18}
n = dic.get("name")
print(n)
输出
Eva

(3)clear:清空字典

dic = {‘name‘:‘eva‘,‘age‘:20}
dic.clear()
print(dic)
输出
{}

(4)pop:根据指定的key删除一组数据

        popitem:随机的删除一组数据

dic = {‘name‘:‘eva‘,‘age‘:20,‘ser‘:3}
s = dic.pop("age")
print(s)

a = dic.popitem() #随机删除一组数据
print(a)
输出
20
(‘name‘, ‘eva‘)

(5)setdefault:dic.setdefault[key1],key1存在,则返回value1,不存在,则自动创建value = ‘None‘

dic = {‘name‘:‘eva‘,‘age‘:20,‘ser‘:3}
z = dic.setdefault(‘name‘)
print(z)

s = dic.setdefault(‘sad‘)
print(s)
输出
eva
None

(6)update:dict1.update(dict2),判断dict2中的每一个key在dict1中是否存在,

存在:就将dict1中的value更新成dict2中的,不存在:将key和value都复制过去

dic1 = {‘name‘:‘Eva‘,‘age‘:18,‘ser‘:3}
dic2 = {‘age‘: 18, ‘name‘: ‘Eva‘,‘gender‘:‘female‘}
dic1.update(dic2)
print(dic1)
输出
{‘gender‘: ‘female‘, ‘name‘: ‘Eva‘, ‘ser‘: 3, ‘age‘: 18}

(7)fromkeys:可以通过list创建一个字典,

dict.fromkeys([1,2,3],‘test‘),可以创建一个字典,但是如果a.fromkeys([1,2,3],[]},创建的字典的值都是一个空列表,那么其中一个列表的值发生了变化,所有的列表

都会跟着发生变化

set集合

set是一个无序且不重复的元素集合

所有方法

[‘__and__‘, ‘__class__‘, ‘__cmp__‘, ‘__contains__‘, ‘__delattr__‘, ‘__doc__‘, ‘_
_eq__‘, ‘__format__‘, ‘__ge__‘, ‘__getattribute__‘, ‘__gt__‘, ‘__hash__‘, ‘__ian
d__‘, ‘__init__‘, ‘__ior__‘, ‘__isub__‘, ‘__iter__‘, ‘__ixor__‘, ‘__le__‘, ‘__le
n__‘, ‘__lt__‘, ‘__ne__‘, ‘__new__‘, ‘__or__‘, ‘__rand__‘, ‘__reduce__‘, ‘__redu
ce_ex__‘, ‘__repr__‘, ‘__ror__‘, ‘__rsub__‘, ‘__rxor__‘, ‘__setattr__‘, ‘__sizeo
f__‘, ‘__str__‘, ‘__sub__‘, ‘__subclasshook__‘, ‘__xor__‘, ‘add‘, ‘clear‘, ‘copy
‘, ‘difference‘, ‘difference_update‘, ‘discard‘, ‘intersection‘, ‘intersection_u
pdate‘, ‘isdisjoint‘, ‘issubset‘, ‘issuperset‘, ‘pop‘, ‘remove‘, ‘symmetric_diff
erence‘, ‘symmetric_difference_update‘, ‘union‘, ‘update‘]

源码

class set(object):
    """
    set() -> new empty set object
    set(iterable) -> new set object

    Build an unordered collection of unique elements.
    """
    def add(self, *args, **kwargs): # real signature unknown
        """ 添加 """
        """
        Add an element to a set.

        This has no effect if the element is already present.
        """
        pass

    def clear(self, *args, **kwargs): # real signature unknown
        """ Remove all elements from this set. """
        pass

    def copy(self, *args, **kwargs): # real signature unknown
        """ Return a shallow copy of a set. """
        pass

    def difference(self, *args, **kwargs): # real signature unknown
        """
        Return the difference of two or more sets as a new set.

        (i.e. all elements that are in this set but not the others.)
        """
        pass

    def difference_update(self, *args, **kwargs): # real signature unknown
        """ 删除当前set中的所有包含在 new set 里的元素 """
        """ Remove all elements of another set from this set. """
        pass

    def discard(self, *args, **kwargs): # real signature unknown
        """ 移除元素 """
        """
        Remove an element from a set if it is a member.

        If the element is not a member, do nothing.
        """
        pass

    def intersection(self, *args, **kwargs): # real signature unknown
        """ 取交集,新创建一个set """
        """
        Return the intersection of two or more sets as a new set.

        (i.e. elements that are common to all of the sets.)
        """
        pass

    def intersection_update(self, *args, **kwargs): # real signature unknown
        """ 取交集,修改原来set """
        """ Update a set with the intersection of itself and another. """
        pass

    def isdisjoint(self, *args, **kwargs): # real signature unknown
        """ 如果没有交集,返回true  """
        """ Return True if two sets have a null intersection. """
        pass

    def issubset(self, *args, **kwargs): # real signature unknown
        """ 是否是子集 """
        """ Report whether another set contains this set. """
        pass

    def issuperset(self, *args, **kwargs): # real signature unknown
        """ 是否是父集 """
        """ Report whether this set contains another set. """
        pass

    def pop(self, *args, **kwargs): # real signature unknown
        """ 移除 """
        """
        Remove and return an arbitrary set element.
        Raises KeyError if the set is empty.
        """
        pass

    def remove(self, *args, **kwargs): # real signature unknown
        """ 移除 """
        """
        Remove an element from a set; it must be a member.

        If the element is not a member, raise a KeyError.
        """
        pass

    def symmetric_difference(self, *args, **kwargs): # real signature unknown
        """ 差集,创建新对象"""
        """
        Return the symmetric difference of two sets as a new set.

        (i.e. all elements that are in exactly one of the sets.)
        """
        pass

    def symmetric_difference_update(self, *args, **kwargs): # real signature unknown
        """ 差集,改变原来 """
        """ Update a set with the symmetric difference of itself and another. """
        pass

    def union(self, *args, **kwargs): # real signature unknown
        """ 并集 """
        """
        Return the union of sets as a new set.

        (i.e. all elements that are in either set.)
        """
        pass

    def update(self, *args, **kwargs): # real signature unknown
        """ 更新 """
        """ Update a set with the union of itself and others. """
        pass

    def __and__(self, y): # real signature unknown; restored from __doc__
        """ x.__and__(y) <==> x&y """
        pass

    def __cmp__(self, y): # real signature unknown; restored from __doc__
        """ x.__cmp__(y) <==> cmp(x,y) """
        pass

    def __contains__(self, y): # real signature unknown; restored from __doc__
        """ x.__contains__(y) <==> y in x. """
        pass

    def __eq__(self, y): # real signature unknown; restored from __doc__
        """ x.__eq__(y) <==> x==y """
        pass

    def __getattribute__(self, name): # real signature unknown; restored from __doc__
        """ x.__getattribute__(‘name‘) <==> x.name """
        pass

    def __ge__(self, y): # real signature unknown; restored from __doc__
        """ x.__ge__(y) <==> x>=y """
        pass

    def __gt__(self, y): # real signature unknown; restored from __doc__
        """ x.__gt__(y) <==> x>y """
        pass

    def __iand__(self, y): # real signature unknown; restored from __doc__
        """ x.__iand__(y) <==> x&=y """
        pass

    def __init__(self, seq=()): # known special case of set.__init__
        """
        set() -> new empty set object
        set(iterable) -> new set object

        Build an unordered collection of unique elements.
        # (copied from class doc)
        """
        pass

    def __ior__(self, y): # real signature unknown; restored from __doc__
        """ x.__ior__(y) <==> x|=y """
        pass

    def __isub__(self, y): # real signature unknown; restored from __doc__
        """ x.__isub__(y) <==> x-=y """
        pass

    def __iter__(self): # real signature unknown; restored from __doc__
        """ x.__iter__() <==> iter(x) """
        pass

    def __ixor__(self, y): # real signature unknown; restored from __doc__
        """ x.__ixor__(y) <==> x^=y """
        pass

    def __len__(self): # real signature unknown; restored from __doc__
        """ x.__len__() <==> len(x) """
        pass

    def __le__(self, y): # real signature unknown; restored from __doc__
        """ x.__le__(y) <==> x<=y """
        pass

    def __lt__(self, y): # real signature unknown; restored from __doc__
        """ x.__lt__(y) <==> x<y """
        pass

    @staticmethod # known case of __new__
    def __new__(S, *more): # real signature unknown; restored from __doc__
        """ T.__new__(S, ...) -> a new object with type S, a subtype of T """
        pass

    def __ne__(self, y): # real signature unknown; restored from __doc__
        """ x.__ne__(y) <==> x!=y """
        pass

    def __or__(self, y): # real signature unknown; restored from __doc__
        """ x.__or__(y) <==> x|y """
        pass

    def __rand__(self, y): # real signature unknown; restored from __doc__
        """ x.__rand__(y) <==> y&x """
        pass

    def __reduce__(self, *args, **kwargs): # real signature unknown
        """ Return state information for pickling. """
        pass

    def __repr__(self): # real signature unknown; restored from __doc__
        """ x.__repr__() <==> repr(x) """
        pass

    def __ror__(self, y): # real signature unknown; restored from __doc__
        """ x.__ror__(y) <==> y|x """
        pass

    def __rsub__(self, y): # real signature unknown; restored from __doc__
        """ x.__rsub__(y) <==> y-x """
        pass

    def __rxor__(self, y): # real signature unknown; restored from __doc__
        """ x.__rxor__(y) <==> y^x """
        pass

    def __sizeof__(self): # real signature unknown; restored from __doc__
        """ S.__sizeof__() -> size of S in memory, in bytes """
        pass

    def __sub__(self, y): # real signature unknown; restored from __doc__
        """ x.__sub__(y) <==> x-y """
        pass

    def __xor__(self, y): # real signature unknown; restored from __doc__
        """ x.__xor__(y) <==> x^y """
        pass

    __hash__ = None

set

一些常用的方法处理set集合

(1)difference  找出集合中不存在的,并将其赋值给新变量

se = {11,22,33,44,}
be = {22,33,55,66,}
ret = se.difference(be) #找出se中存在be中不存在的集合,并将其赋值给新变量
print(ret)
运算结果:
{11, 44}

(2)difference _update()  找到se中存在,be中不存在的集合,更新自己

se = {11,22,33,44,}
be = {22,33,55,66,}

ret = se.difference_update(be) #找到se中存在,be中不存在的集合,更新自己
print(se)
运算结果:
{11, 44}

(3)intersection 交集

l1=[11,22,33]
l2=[22,33,44]
ret = list(set(l1).intersection(set(l2))) #交集
print(ret)
输出:
[33, 22]

(4)symmetric_difference  对称交集

se = {11,22,33,44,}
be = {22,33,55,66,}
ret = se.symmetric_difference(be) #对称交集
print()
运算结果:
{66, 11, 44, 55}

(5) union 并集

se = {11,22,33,44,}
be = {22,33,55,66,}
ret = se.union(be)  # 并集
print(ret)
运算结果:
{33, 66, 11, 44, 22, 55}

(6)discard  移除指定文件,不存在是不报错

remove移除元素,不存在会报错

se = {22,33,44,}
ret = se.discard(11)#移除指定文件,不存在是不报错
 print(ret) 运算结果: None

se = {22,33,44,}
ret = se.remove(11) #移除元素,不存在会报错
print(se)

(7)clear 清除集合

se = {22,33,44,}
ret = se.clear()  # 清除集合
print(se)
运算结果:
set()

(8) add 增加

se = {22,33,44,}
ret = se.add(35) # 增加
print(se)
运算结果:
{33, 35, 44, 22}

(9)issubset 判断交集有是False,没有True

se = {22,33,44,}
be = {22,33,55,66,}
ret = se.issubset(be) #判断交集有是False,没有True
print(ret)
运算结果:
False
时间: 2024-10-16 21:16:22

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