Method _lookup

Lib/mailbox.py:609–620

Use TOC to return subpath for given key, or raise a KeyError.

(self, key)

        self._last_read = time.time()

    def _lookup(self, key):
        """Use TOC to return subpath for given key, or raise a KeyError."""
        try:
            if os.path.exists(os.path.join(self._path, self._toc[key])):
                return self._toc[key]
        except KeyError:
            pass
        self._refresh()
        try:
            return self._toc[key]
        except KeyError:
            raise KeyError('No message with key: %s' % key) from None

    # This method is for backward compatibility only.
    def next(self):