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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _get_writable(stream_or_path, mode):
 """This method returns a tuple containing the stream and a flag to indicate if the stream should be automatically closed. The `stream_or_path` parameter is returned if it is an open writable stream. Otherwise, it treats the `stream_or_path` parameter as a file path and opens it with the given mode. It is used by the svg and png methods to interpret the file parameter. :type stream_or_path: str | io.BufferedIOBase :type mode: str | unicode :rtype: (io.BufferedIOBase, bool) """

    is_stream = hasattr(stream_or_path, 'write')
    if not is_stream:
        # No stream provided, treat "stream_or_path" as path
        stream_or_path = open(stream_or_path, mode)
    return stream_or_path, not is_stream