Method add_sequence

Lib/mailbox.py:1852–1858

Add sequence to list of sequences including the message.

(self, sequence)

        self._sequences = list(sequences)

    def add_sequence(self, sequence):
        """Add sequence to list of sequences including the message."""
        if isinstance(sequence, str):
            if not sequence in self._sequences:
                self._sequences.append(sequence)
        else:
            raise TypeError('sequence type must be str: %s' % type(sequence))

    def remove_sequence(self, sequence):
        """Remove sequence from the list of sequences including the message."""