python之路 之open

一、open:文件打开操作

文件句柄 = open(‘文件路径‘,‘读写模式‘)

打开文件的模式有：

r:只读，默认（文件不存在则报错）

w:只写（文件不存在则自动创建）

a:追加（文件不存在则自动创建）

‘+‘表示可同时读写文件

r+:读写（可读，可写，可追加），可读可写，不会清空文件

w+:写读，可使用read系列

a+:同a

"U"表示在读取时，可以将 \r \n \r\n自动转换成 \n （与 r 或 r+ 模式同使用）

rU

r+U

b：处理进制文件（如FTP发送上传镜像ISO文件，linux可忽略，WINDOWS处理二进制时需要标注）

rb

wr

ab

  1 class TextIOWrapper(_TextIOBase):
  2     """
  3     Character and line based layer over a BufferedIOBase object, buffer.
  4
  5     encoding gives the name of the encoding that the stream will be
  6     decoded or encoded with. It defaults to locale.getpreferredencoding(False).
  7
  8     errors determines the strictness of encoding and decoding (see
  9     help(codecs.Codec) or the documentation for codecs.register) and
 10     defaults to "strict".
 11
 12     newline controls how line endings are handled. It can be None, ‘‘,
 13     ‘\n‘, ‘\r‘, and ‘\r\n‘.  It works as follows:
 14
 15     * On input, if newline is None, universal newlines mode is
 16       enabled. Lines in the input can end in ‘\n‘, ‘\r‘, or ‘\r\n‘, and
 17       these are translated into ‘\n‘ before being returned to the
 18       caller. If it is ‘‘, universal newline mode is enabled, but line
 19       endings are returned to the caller untranslated. If it has any of
 20       the other legal values, input lines are only terminated by the given
 21       string, and the line ending is returned to the caller untranslated.
 22
 23     * On output, if newline is None, any ‘\n‘ characters written are
 24       translated to the system default line separator, os.linesep. If
 25       newline is ‘‘ or ‘\n‘, no translation takes place. If newline is any
 26       of the other legal values, any ‘\n‘ characters written are translated
 27       to the given string.
 28
 29     If line_buffering is True, a call to flush is implied when a call to
 30     write contains a newline character.
 31     """
 32     def close(self, *args, **kwargs): # real signature unknown
 33         关闭文件
 34         pass
 35
 36     def fileno(self, *args, **kwargs): # real signature unknown
 37         文件描述符
 38         pass
 39
 40     def flush(self, *args, **kwargs): # real signature unknown
 41         刷新文件内部缓冲区
 42         pass
 43
 44     def isatty(self, *args, **kwargs): # real signature unknown
 45         判断文件是否是同意tty设备
 46         pass
 47
 48     def read(self, *args, **kwargs): # real signature unknown
 49         读取指定字节数据
 50         pass
 51
 52     def readable(self, *args, **kwargs): # real signature unknown
 53         是否可读
 54         pass
 55
 56     def readline(self, *args, **kwargs): # real signature unknown
 57         仅读取一行数据
 58         pass
 59
 60     def seek(self, *args, **kwargs): # real signature unknown
 61         指定文件中指针位置
 62         pass
 63
 64     def seekable(self, *args, **kwargs): # real signature unknown
 65         指针是否可操作
 66         pass
 67
 68     def tell(self, *args, **kwargs): # real signature unknown
 69         获取指针位置
 70         pass
 71
 72     def truncate(self, *args, **kwargs): # real signature unknown
 73         截断数据，仅保留指定之前数据
 74         pass
 75
 76     def writable(self, *args, **kwargs): # real signature unknown
 77         是否可写
 78         pass
 79
 80     def write(self, *args, **kwargs): # real signature unknown
 81         写内容
 82         pass
 83
 84     def __getstate__(self, *args, **kwargs): # real signature unknown
 85         pass
 86
 87     def __init__(self, *args, **kwargs): # real signature unknown
 88         pass
 89
 90     @staticmethod # known case of __new__
 91     def __new__(*args, **kwargs): # real signature unknown
 92         """ Create and return a new object.  See help(type) for accurate signature. """
 93         pass
 94
 95     def __next__(self, *args, **kwargs): # real signature unknown
 96         """ Implement next(self). """
 97         pass
 98
 99     def __repr__(self, *args, **kwargs): # real signature unknown
100         """ Return repr(self). """
101         pass
102
103     buffer = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
104
105     closed = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
106
107     encoding = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
108
109     errors = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
110
111     line_buffering = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
112
113     name = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
114
115     newlines = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
116
117     _CHUNK_SIZE = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
118
119     _finalizing = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default
120
121 Python 3.x