def read(self, size=-1): # known case of _io.FileIO.read        """        注意，不一定能全读回来        Read at most size bytes, returned as bytes.        Only makes one system call, so less data may be returned than requested.        In non-blocking mode, returns None if no data is available.        Return an empty bytes object at EOF.        """        return ""def readline(self, *args, **kwargs):        passdef readlines(self, *args, **kwargs):        passdef tell(self, *args, **kwargs): # real signature unknown        """        Current file position.        Can raise OSError for non seekable files.        """        passdef seek(self, *args, **kwargs): # real signature unknown        """        Move to new file position and return the file position.        Argument offset is a byte count.  Optional argument whence defaults to        SEEK_SET or 0 (offset from start of file, offset should be >= 0); other values        are SEEK_CUR or 1 (move relative to current position, positive or negative),        and SEEK_END or 2 (move relative to end of file, usually negative, although        many platforms allow seeking beyond the end of a file).        Note that not all file objects are seekable.        """        passdef write(self, *args, **kwargs): # real signature unknown        """        Write bytes b to file, return number written.        Only makes one system call, so not all of the data may be written.        The number of bytes actually written is returned.  In non-blocking mode,        returns None if the write would block.        """        passdef flush(self, *args, **kwargs):        passdef truncate(self, *args, **kwargs): # real signature unknown        """        Truncate the file to at most size bytes and return the truncated size.        Size defaults to the current file position, as returned by tell().        The current file position is changed to the value of size.        """        passdef close(self): # real signature unknown; restored from __doc__            """            Close the file.            A closed file cannot be used for further I/O operations.  close() may be            called more than once without error.            """            pass##############################################################less usefull    def fileno(self, *args, **kwargs): # real signature unknown            """ Return the underlying file descriptor (an integer). """            pass    def isatty(self, *args, **kwargs): # real signature unknown        """ True if the file is connected to a TTY device. """        pass    def readable(self, *args, **kwargs): # real signature unknown        """ True if file was opened in a read mode. """        pass    def readall(self, *args, **kwargs): # real signature unknown        """        Read all data from the file, returned as bytes.        In non-blocking mode, returns as much as is immediately available,        or None if no data is available.  Return an empty bytes object at EOF.        """        pass    def seekable(self, *args, **kwargs): # real signature unknown        """ True if file supports random-access. """        pass    def writable(self, *args, **kwargs): # real signature unknown        """ True if file was opened in a write mode. """        pass操作方法介绍