Class itemgetter

Lib/operator.py:279–308

Return a callable object that fetches the given item(s) from its operand. After f = itemgetter(2), the call f(r) returns r[2]. After g = itemgetter(2, 5, 3), the call g(r) returns (r[2], r[5], r[3])

        return self.__class__, self._attrs

class itemgetter:
    """
    Return a callable object that fetches the given item(s) from its operand.
    After f = itemgetter(2), the call f(r) returns r[2].
    After g = itemgetter(2, 5, 3), the call g(r) returns (r[2], r[5], r[3])
    """
    __slots__ = ('_items', '_call')

    def __init__(self, item, /, *items):
        if not items:
            self._items = (item,)
            def func(obj):
                return obj[item]
            self._call = func
        else:
            self._items = items = (item,) + items
            def func(obj):
                return tuple(obj[i] for i in items)
            self._call = func

    def __call__(self, obj, /):
        return self._call(obj)

    def __repr__(self):
        return '%s.%s(%s)' % (self.__class__.__module__,
                              self.__class__.__name__,
                              ', '.join(map(repr, self._items)))

    def __reduce__(self):
        return self.__class__, self._items

class methodcaller:
    """