Method __delitem__

Lib/os.py:718–725

(self, key)

        self._data[key] = value

    def __delitem__(self, key):
        encodedkey = self.encodekey(key)
        unsetenv(encodedkey)
        try:
            del self._data[encodedkey]
        except KeyError:
            # raise KeyError with the original key value
            raise KeyError(key) from None

    def __iter__(self):
        # list() from dict object is an atomic operation