python学习变量赋值问题?答:a, b, c, d = None, None, 'yyyy', 'aaaa'dict_test = {'a': 'red', 'b': 'yellow', 'c': 'blue', 'd': 'black'} for k, v in dict(globals()).items():if v == None and k in dict_test:globals()[k] = dict_test[k]print(a, b, c, d)red yellow yyyy ...