bytecontainer.py 文件源码

def open(self, mode='r', encoding=None):
        """Return file-like object

        Args:
            mode (str): access mode (only reading modes are supported)
            encoding (str): text decoding method for text access (default: system default)

        Returns:
            io.BytesIO OR io.TextIOWrapper: buffer accessing the file as bytes or characters
        """
        access_type = self._get_access_type(mode)

        if access_type == 't' and encoding is not None and encoding != self.encoded_with:
            warnings.warn('Attempting to decode %s as "%s", but encoding is declared as "%s"'
                          % (self, encoding, self.encoded_with))

        if encoding is None:
            encoding = self.encoded_with

        buffer = io.BytesIO(self._contents)
        if access_type == 'b':
            return buffer
        else:
            return io.TextIOWrapper(buffer, encoding=encoding)