类名str
基本操作
- 切片 [开始位置：结束位置(：步长)]
s = "hello，world！"
取前两个字符 s = [0:2] 0可以省略，切片取头不取尾
反转字符串 s = [-1 : : -1]
取整个字符串 s = [ : ] 后面什么都不写默认取完
- 索引 [索引值] 注：不支持索引修改字符串值，会报错
索引值的范围是0-字符串长度减一，超过这个范围会报错(IndexError: string index out of range)
- 各种方法函数：
1 def capitalize(self): # real signature unknown; restored from __doc__ #将字符串首字母大写，其余小写
2 """
3 S.capitalize() -> str
4
5 Return a capitalized version of S, i.e. make the first character
6 have upper case and the rest lower case.
7 """
8 return ""
9
10 def casefold(self): # real signature unknown; restored from __doc__ #将不分语种的字符串全部小写
11 """
12 S.casefold() -> str
13
14 Return a version of S suitable for caseless comparisons.
15 """
16 return ""
17
18 def center(self, width, fillchar=None): # real signature unknown; restored from __doc__ 将字符串填入width长的字符中间，并将其余字符用fillchar填充
19 """
20 S.center(width[, fillchar]) -> str
21
22 Return S centered in a string of length width. Padding is
23 done using the specified fill character (default is a space)
24 """
25 return ""
26
27 def count(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 返回sub子序列在字符串指定位置中出现次数，start开始位置，end结束位置
28 """
29 S.count(sub[, start[, end]]) -> int
30
31 Return the number of non-overlapping occurrences of substring sub in
32 string S[start:end]. Optional arguments start and end are
33 interpreted as in slice notation.
34 """
35 return 0
36
37 def encode(self, encoding=‘utf-8‘, errors=‘strict‘): # real signature unknown; restored from __doc__ 改变编码格式 默认utf-8
38 """
39 S.encode(encoding=‘utf-8‘, errors=‘strict‘) -> bytes
40
41 Encode S using the codec registered for encoding. Default encoding
42 is ‘utf-8‘. errors may be given to set a different error
43 handling scheme. Default is ‘strict‘ meaning that encoding errors raise
44 a UnicodeEncodeError. Other possible values are ‘ignore‘, ‘replace‘ and
45 ‘xmlcharrefreplace‘ as well as any other name registered with
46 codecs.register_error that can handle UnicodeEncodeErrors.
47 """
48 return b""
49
50 def endswith(self, suffix, start=None, end=None): # real signature unknown; restored from __doc__ 判断字符串是否以suffix子序列结尾，strat开始，end结束
51 """
52 S.endswith(suffix[, start[, end]]) -> bool
53
54 Return True if S ends with the specified suffix, False otherwise.
55 With optional start, test S beginning at that position.
56 With optional end, stop comparing S at that position.
57 suffix can also be a tuple of strings to try.
58 """
59 return False
60
61 def expandtabs(self, tabsize=8): # real signature unknown; restored from __doc__ 指定制表符/t占有位数，tabsize指定占有位数
62 """
63 S.expandtabs(tabsize=8) -> str
64
65 Return a copy of S where all tab characters are expanded using spaces.
66 If tabsize is not given, a tab size of 8 characters is assumed.
67 """
68 return ""
69
70 def find(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 返回在字符串中最先出现的子序列的索引号，如果不存在返回-1
71 """
72 S.find(sub[, start[, end]]) -> int
73
74 Return the lowest index in S where substring sub is found,
75 such that sub is contained within S[start:end]. Optional
76 arguments start and end are interpreted as in slice notation.
77
78 Return -1 on failure.
79 """
80 return 0
81
82 def format(self, *args, **kwargs): # known special case of str.format 字符串格式化
83 """
84 S.format(*args, **kwargs) -> str
85
86 Return a formatted version of S, using substitutions from args and kwargs.
87 The substitutions are identified by braces (‘{‘ and ‘}‘).
88 """
89 pass
90
91 def format_map(self, mapping): # real signature unknown; restored from __doc__ 字符串格式化，指定mapping格式
92 """
93 S.format_map(mapping) -> str
94
95 Return a formatted version of S, using substitutions from mapping.
96 The substitutions are identified by braces (‘{‘ and ‘}‘).
97 """
98 return ""
99
100 def index(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 返回子序列的索引，无则报错
101 """
102 S.index(sub[, start[, end]]) -> int
103
104 Return the lowest index in S where substring sub is found,
105 such that sub is contained within S[start:end]. Optional
106 arguments start and end are interpreted as in slice notation.
107
108 Raises ValueError when the substring is not found.
109 """
110 return 0
111
112 def isalnum(self): # real signature unknown; restored from __doc__ 判断是否全是数字、字母
113 """
114 S.isalnum() -> bool
115
116 Return True if all characters in S are alphanumeric
117 and there is at least one character in S, False otherwise.
118 """
119 return False
120
121 def isalpha(self): # real signature unknown; restored from __doc__ 判断是否全是字母
122 """
123 S.isalpha() -> bool
124
125 Return True if all characters in S are alphabetic
126 and there is at least one character in S, False otherwise.
127 """
128 return False
129
130 def isdecimal(self): # real signature unknown; restored from __doc__ 判断是否全是十进制数字
131 """
132 S.isdecimal() -> bool
133
134 Return True if there are only decimal characters in S,
135 False otherwise.
136 """
137 return False
138
139 def isdigit(self): # real signature unknown; restored from __doc__ 判断是否全是数字
140 """
141 S.isdigit() -> bool
142
143 Return True if all characters in S are digits
144 and there is at least one character in S, False otherwise.
145 """
146 return False
147
148 def isidentifier(self): # real signature unknown; restored from __doc__ 判断是否是有效标识符，用来判断变量命名是否合法
149 """
150 S.isidentifier() -> bool
151
152 Return True if S is a valid identifier according
153 to the language definition.
154
155 Use keyword.iskeyword() to test for reserved identifiers
156 such as "def" and "class".
157 """
158 return False
159
160 def islower(self): # real signature unknown; restored from __doc__ 判断是否全是小写
161 """
162 S.islower() -> bool
163
164 Return True if all cased characters in S are lowercase and there is
165 at least one cased character in S, False otherwise.
166 """
167 return False
168
169 def isnumeric(self): # real signature unknown; restored from __doc__ 判断是否全是数字
170 """
171 S.isnumeric() -> bool
172
173 Return True if there are only numeric characters in S,
174 False otherwise.
175 """
176 return False
177
178 def isprintable(self): # real signature unknown; restored from __doc__ 判断是否全可以打印
179 """
180 S.isprintable() -> bool
181
182 Return True if all characters in S are considered
183 printable in repr() or S is empty, False otherwise.
184 """
185 return False
186
187 def isspace(self): # real signature unknown; restored from __doc__ 判断是否全是空格、换行符、制表符
188 """
189 S.isspace() -> bool
190
191 Return True if all characters in S are whitespace
192 and there is at least one character in S, False otherwise.
193 """
194 return False
195
196 def istitle(self): # real signature unknown; restored from __doc__ 判断是否是标题字符
197 """
198 S.istitle() -> bool
199
200 Return True if S is a titlecased string and there is at least one
201 character in S, i.e. upper- and titlecase characters may only
202 follow uncased characters and lowercase characters only cased ones.
203 Return False otherwise.
204 """
205 return False
206
207 def isupper(self): # real signature unknown; restored from __doc__ 判断是否全是大写
208 """
209 S.isupper() -> bool
210
211 Return True if all cased characters in S are uppercase and there is
212 at least one cased character in S, False otherwise.
213 """
214 return False
215
216 def join(self, iterable): # real signature unknown; restored from __doc__ 生成一个由指定字符串填充连接可迭代字符的字符串
217 """
218 S.join(iterable) -> str
219
220 Return a string which is the concatenation of the strings in the
221 iterable. The separator between elements is S.
222 """
223 return ""
224
225 def ljust(self, width, fillchar=None): # real signature unknown; restored from __doc__ 内容左对齐，右侧填充，默认空格，可选fillchar
226 """
227 S.ljust(width[, fillchar]) -> str
228
229 Return S left-justified in a Unicode string of length width. Padding is
230 done using the specified fill character (default is a space).
231 """
232 return ""
233
234 def lower(self): # real signature unknown; restored from __doc__ 将字符串中的所有英文字母小写
235 """
236 S.lower() -> str
237
238 Return a copy of the string S converted to lowercase.
239 """
240 return ""
241
242 def lstrip(self, chars=None): # real signature unknown; restored from __doc__ 移除左侧空格
243 """
244 S.lstrip([chars]) -> str
245
246 Return a copy of the string S with leading whitespace removed.
247 If chars is given and not None, remove characters in chars instead.
248 """
249 return ""
250
251 def maketrans(self, *args, **kwargs): # real signature unknown 创建字符映射的转换表
252 """
253 Return a translation table usable for str.translate().
254
255 If there is only one argument, it must be a dictionary mapping Unicode
256 ordinals (integers) or characters to Unicode ordinals, strings or None.
257 Character keys will be then converted to ordinals.
258 If there are two arguments, they must be strings of equal length, and
259 in the resulting dictionary, each character in x will be mapped to the
260 character at the same position in y. If there is a third argument, it
261 must be a string, whose characters will be mapped to None in the result.
262 """
263 pass
264
265 def partition(self, sep): # real signature unknown; restored from __doc__ 将字符串分成三部分：sep序列、sep前序列、sep后序列
266 """
267 S.partition(sep) -> (head, sep, tail)
268
269 Search for the separator sep in S, and return the part before it,
270 the separator itself, and the part after it. If the separator is not
271 found, return S and two empty strings.
272 """
273 pass
274
275 def replace(self, old, new, count=None): # real signature unknown; restored from __doc__ 替换字符，count指定替换次数
276 """
277 S.replace(old, new[, count]) -> str
278
279 Return a copy of S with all occurrences of substring
280 old replaced by new. If the optional argument count is
281 given, only the first count occurrences are replaced.
282 """
283 return ""
284
285 def rfind(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 返回从右往左查找子序列的索引，没找到返回-1
286 """
287 S.rfind(sub[, start[, end]]) -> int
288
289 Return the highest index in S where substring sub is found,
290 such that sub is contained within S[start:end]. Optional
291 arguments start and end are interpreted as in slice notation.
292
293 Return -1 on failure.
294 """
295 return 0
296
297 def rindex(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ 从右边开始查找子序列，没找到报错
298 """
299 S.rindex(sub[, start[, end]]) -> int
300
301 Return the highest index in S where substring sub is found,
302 such that sub is contained within S[start:end]. Optional
303 arguments start and end are interpreted as in slice notation.
304
305 Raises ValueError when the substring is not found.
306 """
307 return 0
308
309 def rjust(self, width, fillchar=None): # real signature unknown; restored from __doc__ 内容右对齐，左侧填充
310 """
311 S.rjust(width[, fillchar]) -> str
312
313 Return S right-justified in a string of length width. Padding is
314 done using the specified fill character (default is a space).
315 """
316 return ""
317
318 def rpartition(self, sep): # real signature unknown; restored from __doc__ 从右边开始，将字符串分成三部分，sep、sep后】sep前
319 """
320 S.rpartition(sep) -> (head, sep, tail)
321
322 Search for the separator sep in S, starting at the end of S, and return
323 the part before it, the separator itself, and the part after it. If the
324 separator is not found, return two empty strings and S.
325 """
326 pass
327
328 def rsplit(self, sep=None, maxsplit=-1): # real signature unknown; restored from __doc__ 从右边开始返回按指定分隔符切割指定次数字符串的list
329 """
330 S.rsplit(sep=None, maxsplit=-1) -> list of strings
331
332 Return a list of the words in S, using sep as the
333 delimiter string, starting at the end of the string and
334 working to the front. If maxsplit is given, at most maxsplit
335 splits are done. If sep is not specified, any whitespace string
336 is a separator.
337 """
338 return []
339
340 def rstrip(self, chars=None): # real signature unknown; restored from __doc__ 移除右侧空白
341 """
342 S.rstrip([chars]) -> str
343
344 Return a copy of the string S with trailing whitespace removed.
345 If chars is given and not None, remove characters in chars instead.
346 """
347 return ""
348
349 def split(self, sep=None, maxsplit=-1): # real signature unknown; restored from __doc__ 按指定分隔符切割字符串，maxsplit指定切割次数，从左往右
350 """
351 S.split(sep=None, maxsplit=-1) -> list of strings
352
353 Return a list of the words in S, using sep as the
354 delimiter string. If maxsplit is given, at most maxsplit
355 splits are done. If sep is not specified or is None, any
356 whitespace string is a separator and empty strings are
357 removed from the result.
358 """
359 return []
360
361 def splitlines(self, keepends=None): # real signature unknown; restored from __doc__ 根据换行符分割字符串
362 """
363 S.splitlines([keepends]) -> list of strings
364
365 Return a list of the lines in S, breaking at line boundaries.
366 Line breaks are not included in the resulting list unless keepends
367 is given and true.
368 """
369 return []
370
371 def startswith(self, prefix, start=None, end=None): # real signature unknown; restored from __doc__ 判断是否以子序列开头
372 """
373 S.startswith(prefix[, start[, end]]) -> bool
374
375 Return True if S starts with the specified prefix, False otherwise.
376 With optional start, test S beginning at that position.
377 With optional end, stop comparing S at that position.
378 prefix can also be a tuple of strings to try.
379 """
380 return False
381
382 def strip(self, chars=None): # real signature unknown; restored from __doc__ 去除首尾空格
383 """
384 S.strip([chars]) -> str
385
386 Return a copy of the string S with leading and trailing
387 whitespace removed.
388 If chars is given and not None, remove characters in chars instead.
389 """
390 return ""
391
392 def swapcase(self): # real signature unknown; restored from __doc__ 大写变小写，小写变大写
393 """
394 S.swapcase() -> str
395
396 Return a copy of S with uppercase characters converted to lowercase
397 and vice versa.
398 """
399 return ""
400
401 def title(self): # real signature unknown; restored from __doc__ 将字符串变为title字符
402 """
403 S.title() -> str
404
405 Return a titlecased version of S, i.e. words start with title case
406 characters, all remaining cased characters have lower case.
407 """
408 return ""
409
410 def translate(self, table): # real signature unknown; restored from __doc__ 转换字符，按照table规则
#intab = "aeiou"#outtab = "12345"#trantab = str.maketrans(intab, outtab)#s = "this is string example....wow!!!"#print(s.translate(trantab)
411 """ 412 S.translate(table) -> str 413 414 Return a copy of the string S in which each character has been mapped 415 through the given translation table. The table must implement 416 lookup/indexing via __getitem__, for instance a dictionary or list, 417 mapping Unicode ordinals to Unicode ordinals, strings, or None. If 418 this operation raises LookupError, the character is left untouched. 419 Characters mapped to None are deleted. 420 """ 421 return "" 422 423 def upper(self): # real signature unknown; restored from __doc__ 大写 424 """ 425 S.upper() -> str 426 427 Return a copy of S converted to uppercase. 428 """ 429 return "" 430 431 def zfill(self, width): # real signature unknown; restored from __doc__ 返回指定长度字符串，原字符串右对齐，左侧填0 432 """ 433 S.zfill(width) -> str 434 435 Pad a numeric string S with zeros on the left, to fill a field 436 of the specified width. The string S is never truncated. 437 """ 438 return ""
1 def __add__(self, *args, **kwargs): # real signature unknown 2 """ 字符串的加法运算 """ 3 """ Return self+value. """ 4 pass 5 6 def __contains__(self, *args, **kwargs): # real signature unknown 7 """ 是否包含 """ 8 """ Return key in self. """ 9 pass 10 11 def __eq__(self, *args, **kwargs): # real signature unknown 12 """ 比较前后两个字符串是否相等 """ 13 """ Return self==value. """ 14 pass 15 16 def __format__(self, format_spec): # real signature unknown; restored from __doc__ 17 """ 字符串格式化 """ 18 """ 19 S.__format__(format_spec) -> str 20 21 Return a formatted version of S as described by format_spec. 22 """ 23 return "" 24 25 def __getattribute__(self, *args, **kwargs): # real signature unknown 26 """ x.__getattribute__(‘name‘) <==> x.name """ 27 """ Return getattr(self, name). """ 28 pass 29 30 def __getitem__(self, *args, **kwargs): # real signature unknown 31 """ 根据索引取值 x.____getitem__(y) <==> x[y] """ 32 """ Return self[key]. """ 33 pass 34 35 def __getnewargs__(self, *args, **kwargs): # real signature unknown 36 """ 内部调用__new__或创建对象时传入参数使用 """ 37 pass 38 39 def __ge__(self, *args, **kwargs): # real signature unknown 40 """ 比较左边的字符串的ascii码值是否大于等于右边的ascii码值 """ 41 """ Return self>=value. """ 42 pass 43 44 def __gt__(self, *args, **kwargs): # real signature unknown 45 """ 比较左边的字符串的ascii码值是否大于右边的ascii码值 """ 46 """ Return self>value. """ 47 pass 48 49 def __hash__(self, *args, **kwargs): # real signature unknown 50 """ 返回字符串的哈希值 """ 51 """ Return hash(self). """ 52 pass 53 54 def __init__(self, value=‘‘, encoding=None, errors=‘strict‘): # known special case of str.__init__ 55 """ 构造方法，创建string对象时调用 """ 56 """ 57 str(object=‘‘) -> str 58 str(bytes_or_buffer[, encoding[, errors]]) -> str 59 60 Create a new string object from the given object. If encoding or 61 errors is specified, then the object must expose a data buffer 62 that will be decoded using the given encoding and error handler. 63 Otherwise, returns the result of object.__str__() (if defined) 64 or repr(object). 65 encoding defaults to sys.getdefaultencoding(). 66 errors defaults to ‘strict‘. 67 # (copied from class doc) 68 """ 69 pass 70 71 def __iter__(self, *args, **kwargs): # real signature unknown 72 """ 返回迭代器对象 """ 73 """ Implement iter(self). """ 74 pass 75 76 def __len__(self, *args, **kwargs): # real signature unknown 77 """ 返回字符串的长度 """ 78 """ Return len(self). """ 79 pass 80 81 def __le__(self, *args, **kwargs): # real signature unknown 82 """ 比较左边的字符串的ascii码值是否小于等于右边的ascii码值 """ 83 """ Return self<=value. """ 84 pass 85 86 def __lt__(self, *args, **kwargs): # real signature unknown 87 """ 比较左边的字符串的ascii码值是否小于右边的ascii码值 """ 88 """ Return self<value. """ 89 pass 90 91 def __mod__(self, *args, **kwargs): # real signature unknown 92 """ Return self%value. """ 93 pass 94 95 def __mul__(self, *args, **kwargs): # real signature unknown 96 """ 字符串的惩罚运算 """ 97 """ Return self*value.n """ 98 99 pass 100 101 @staticmethod # known case of __new__ 102 def __new__(*args, **kwargs): # real signature unknown 103 """ Create and return a new object. See help(type) for accurate signature. """ 104 pass 105 106 def __ne__(self, *args, **kwargs): # real signature unknown 107 """ x.__ne__(y) 如果x与y的值不相等，返回True,相等则返回False """ 108 """ Return self!=value. """ 109 pass 110 111 def __repr__(self, *args, **kwargs): # real signature unknown 112 """ 转化为解释器可读取的形式 """ 113 """ Return repr(self). """ 114 pass 115 116 def __rmod__(self, *args, **kwargs): # real signature unknown 117 """ Return value%self. """ 118 pass 119 120 def __rmul__(self, *args, **kwargs): # real signature unknown 121 """ 字符串的乘法运算 """ 122 """ Return self*value. """ 123 pass 124 125 def __sizeof__(self): # real signature unknown; restored from __doc__ 126 """ 返回在内存中占用的字节数 """ 127 """ S.__sizeof__() -> size of S in memory, in bytes """ 128 pass 129 130 def __str__(self, *args, **kwargs): # real signature unknown 131 """ 转化成可读取的形式 """ 132 """ Return str(self). """ 133 pass
原文地址：https://www.cnblogs.com/rodger/p/10657442.html
时间： 2024-10-04 15:35:13