>>> 2 * 510>>> 2 ** 532
位置参数(positional argument)
关键词参数(keyword argument)
*args 表示任何多个无名参数,它本质是一个 tuple
**kwargs 表示关键字参数,它本质上是一个 dict
>>> def fun(*args, **kwargs):... print('args=', args)... print('kwargs=', kwargs)... >>> fun(1, 2, 3, 4, A='a', B='b', C='c', D='d')args= (1, 2, 3, 4)kwargs= {'A': 'a', 'B': 'b', 'C': 'c', 'D': 'd'}
>>> def fun(name, *args):... print('你好:', name)... for i in args:... print("你的宠物有:", i)... >>> fun("Geek", "dog", "cat")你好: Geek你的宠物有: dog你的宠物有: cat
>>> def fun(**kwargs):... for key, value in kwargs.items():... print("{0} 喜欢 {1}".format(key, value))... >>> fun(Geek="cat", cat="box")Geek 喜欢 catcat 喜欢 box
>>> def fun(data1, data2, data3):... print("data1: ", data1)... print("data2: ", data2)... print("data3: ", data3)... >>> args = ("one", 2, 3)>>> fun(*args)data1: onedata2: 2data3: 3>>> kwargs = {"data3": "one", "data2": 2, "data1": 3}>>> fun(**kwargs)data1: 3data2: 2data3: one
>>> a, b, *c = 0, 1, 2, 3 >>> a0 >>> b1 >>> c[2, 3]