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

　　

 class TextIOWrapper(_TextIOBase):
     """
     Character and line based layer over a BufferedIOBase object, buffer.

     encoding gives the name of the encoding that the stream will be
     decoded or encoded with. It defaults to locale.getpreferredencoding(False).

     errors determines the strictness of encoding and decoding (see
     help(codecs.Codec) or the documentation for codecs.register) and
     defaults to "strict".

     newline controls how line endings are handled. It can be None, '',
     '\n', '\r', and '\r\n'.  It works as follows:

     * On input, if newline is None, universal newlines mode is
       enabled. Lines in the input can end in '\n', '\r', or '\r\n', and
       these are translated into '\n' before being returned to the
       caller. If it is '', universal newline mode is enabled, but line
       endings are returned to the caller untranslated. If it has any of
       the other legal values, input lines are only terminated by the given
       string, and the line ending is returned to the caller untranslated.

     * On output, if newline is None, any '\n' characters written are
       translated to the system default line separator, os.linesep. If
       newline is '' or '\n', no translation takes place. If newline is any
       of the other legal values, any '\n' characters written are translated
       to the given string.

     If line_buffering is True, a call to flush is implied when a call to
     write contains a newline character.
     """
     def close(self, *args, **kwargs): # real signature unknown
         关闭文件
         pass

     def fileno(self, *args, **kwargs): # real signature unknown
         文件描述符
         pass

     def flush(self, *args, **kwargs): # real signature unknown
         刷新文件内部缓冲区
         pass

     def isatty(self, *args, **kwargs): # real signature unknown
         判断文件是否是同意tty设备
         pass

     def read(self, *args, **kwargs): # real signature unknown
         读取指定字节数据
         pass

     def readable(self, *args, **kwargs): # real signature unknown
         是否可读
         pass

     def readline(self, *args, **kwargs): # real signature unknown
         仅读取一行数据
         pass

     def seek(self, *args, **kwargs): # real signature unknown
         指定文件中指针位置
         pass

     def seekable(self, *args, **kwargs): # real signature unknown
         指针是否可操作
         pass

     def tell(self, *args, **kwargs): # real signature unknown
         获取指针位置
         pass

     def truncate(self, *args, **kwargs): # real signature unknown
         截断数据，仅保留指定之前数据
         pass

     def writable(self, *args, **kwargs): # real signature unknown
         是否可写
         pass

     def write(self, *args, **kwargs): # real signature unknown
         写内容
         pass

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

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

     @staticmethod # known case of __new__
     def __new__(*args, **kwargs): # real signature unknown
         """ Create and return a new object.  See help(type) for accurate signature. """
         pass

     def __next__(self, *args, **kwargs): # real signature unknown
         """ Implement next(self). """
         pass

     def __repr__(self, *args, **kwargs): # real signature unknown
         """ Return repr(self). """
         pass

     buffer = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     closed = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     encoding = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     errors = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     line_buffering = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     name = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     newlines = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     _CHUNK_SIZE = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

     _finalizing = property(lambda self: object(), lambda self, v: None, lambda self: None)  # default

 Python .x