def copy(self):
            'New ChainMap or subclass with a new copy of maps[0] and refs to maps[1:]'
            return self.__class__(self.maps[0].copy(), *self.maps[1:])
New ChainMap or subclass with a new copy of maps[0] and refs to maps[1:]
product/gradle-plugin/src/main/python/pip/_vendor/distlib/compat.py