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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 read_all(self) -> str: """ Reads the current state of the buffer and returns a string those contents :return: A string for the current state of the print buffer contents """

        try:
            buffered_bytes = self.bytes_buffer.getvalue()
            if buffered_bytes is None:
                return ''

            return buffered_bytes.decode(self.source_encoding)
        except Exception as err:
            return 'Redirect Buffer Error: {}'.format(err)