def get_free_vars(self):
        if not self.nested:
            return ()
        free = {}
        free.update(self.frees)
        for name in self.uses.keys():
            if self.defs not in name and name not in self.globals:
                free[name] = 1
        return free.keys()
dataset/ETHPy150Open anandology/pyjamas/pgen/lib2to3/compiler/symbols.py/Scope.get_free_vars/swapped operands of `not in`