iotools.py 文件源码

def make_stream(name,
                bin_file,
                mode='r',
                buffering=-1,
                encoding=None,
                errors=None,
                newline='',
                line_buffering=False,
                **kwargs):
    """Take a Python 2.x binary file and return an IO Stream.
    """
    reading = 'r' in mode
    writing = 'w' in mode
    appending = 'a' in mode
    binary = 'b' in mode
    if '+' in mode:
        reading = True
        writing = True

    encoding = None if binary else (encoding or 'utf-8')

    io_object = RawWrapper(bin_file, mode=mode, name=name)
    if buffering >= 0:
        if reading and writing:
            io_object = io.BufferedRandom(
                io_object,
                buffering or io.DEFAULT_BUFFER_SIZE
            )
        elif reading:
            io_object = io.BufferedReader(
                io_object,
                buffering or io.DEFAULT_BUFFER_SIZE
            )
        elif writing or appending:
            io_object = io.BufferedWriter(
                io_object,
                buffering or io.DEFAULT_BUFFER_SIZE
            )

    if not binary:
        io_object = io.TextIOWrapper(
            io_object,
            encoding=encoding,
            errors=errors,
            newline=newline,
            line_buffering=line_buffering,
        )

    return io_object