Method _pre_mailbox_hook

Lib/mailbox.py:772–774

Called before writing the mailbox to file f.

(self, f)

            _lock_file(self._file, dotlock=False)

    def _pre_mailbox_hook(self, f):
        """Called before writing the mailbox to file f."""
        return

    def _pre_message_hook(self, f):
        """Called before writing each message to file f."""