Method popitem

Lib/collections/__init__.py:1130–1135

Remove and return an item pair from maps[0]. Raise KeyError is maps[0] is empty.

(self)

            raise KeyError(f'Key not found in the first mapping: {key!r}')

    def popitem(self):
        'Remove and return an item pair from maps[0]. Raise KeyError is maps[0] is empty.'
        try:
            return self.maps[0].popitem()
        except KeyError:
            raise KeyError('No keys found in the first mapping.')

    def pop(self, key, *args):
        'Remove *key* from maps[0] and return its value. Raise KeyError if *key* not in maps[0].'