python-11 函数定义、传参、缺省值、可变参数

函数

def add(x,y):
    print(x,y)
    return x + y 

函数参数

缺省值参数要往后放

可变参数

def sum1(*iterable):   # 可变形参，接收 0-n 个
    print(type(iterable), iterable)
    s = 0 
    for x in iterable:
        s += x 
    return s 

可变参数混合使用

keyword-only

def fn5(x, y, z=100, *args, m, n=200, o, **kwargs):
    pass

参数解构

一个 * 解开一维（一层）
两个 ** 解 字典

import random
def max_min(x,y,*args):
    print(x,y,args)
    return (max(x,y,*args), min(x,y,*args))

max_min(*(random.randint(100, 110) for i in range(random.randint(2, 10))))

print(max_min(*(random.randint(100, 110) for i in range(random.randint(2, 10)))))

print(1,2,3,4, sep='\n')

def get_double_vals():
    max_ = min_ = None
    while True:
        nums = input('>>').replace(',',' ').split()
        if not nums:
            break
        nums = [int(x) for x in nums]
        if max_ is None:
            max_ = min_ = nums[0]
        max_ = max(max_, *nums)
        min_ = min(min_, *nums)
        print(max_, min_)