[Python进阶]001.不定参数

不定参数

---

• 介绍
• 元组参数
• 字典参数
• 混合

介绍

• 不定参数用 * 和 ** 定义
• 不定参数必须在其他所有参数之后
• 例子：os.path.join 方法就可以写入不定数量的参数

元组参数

• 定义：*args 以*作为参数前缀
• 会将传入的多个参数作为一个元组传入

代码

def fun(*args):
    for i in args:
        print i

fun('a', 'b', 'c', 'd')

def fun2(arg1, arg2, *args):        # 带2个固定参数
    print 'arg1:', arg1
    print 'arg2:', arg2
    print 'args:', args

fun2('a', 'b', 'c', 'd', 'e')

字典参数

• 定义：**kwargs 以**作为参数前缀
• 会将传入的多个参数作为一个字典传入

代码

def fun(**kwargs):
    for key in kwargs:
        print key, kwargs[key]

fun(a='arg1', b='arg2')

混合

代码

def fun(arg1, arg2, *args, **kwargs):
    print args
    print kwargs

fun('a', 'b', 'c', 'd', key1='e', key2='f')

---

本站文章为宝宝巴士 SD.Team原创，转载务必在明显处注明：（作者官方网站：宝宝巴士) 
转载自【宝宝巴士SuperDo团队】 原文链接: http://www.cnblogs.com/superdo/p/4774247.html

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