"""python的拆包和封包之 *号在函数形参和实参的区别1. 在函数形参定义时添加*就是封包过程，封包默认是以元组形式进行封包2. 在函数实参调用过程添加*就是拆包过程，拆包过程中会报列表或者元组拆成单个元素"""subject = ["math", "chinese", 'english', 'physics', 'history']def print_subject_one(sub): print(*sub)def print_subject_two(*sub): print(sub)def print_subject_three(*sub): print(*sub)def print_subject_four(*sub): print(*sub)def print_subject_five(*sub): print(sub)print_subject_one(subject) # math chinese english physics historyprint_subject_two(subject) # (['math', 'chinese', 'english', 'physics', 'history'],)print_subject_three(subject) # ['math', 'chinese', 'english', 'physics', 'history']print_subject_four(*subject) # math chinese english physics historyprint_subject_five(*subject) # ('math', 'chinese', 'english', 'physics', 'history')"""python的拆包和封包之 **号在函数形参和实参的区别1. 在函数形参定义时添加**就是封包过程，封包默认是字典形式进行封包,2. 在函数实参调用过程添加**就是拆包过程，通常在存在关键字参数的函数去使用**对字典进行拆包"""hobby = {"jack": "dance", "henry": "basketball", "jenny": "swimming", "richard": "reading"}def print_hobby_one(**bby): print(bby)def print_hobby_two(**bby): print(bby)def print_hobby_three(**bby): if "jack" in bby: print('jack like dance') if "jenny" in bby: print("jenny like swimming")print_hobby_one(**hobby) # {'jack': 'dance', 'henry': 'basketball', 'jenny': 'swimming', 'richard': 'reading'}print_hobby_two(jack='dance', henry='basketball') # {'jack': 'dance', 'henry': 'basketball'}print_hobby_three(**hobby) # jack like dance jenny like swimming"""python的拆包和封包之 * 在其它场景的应用"""a, *_, c = [1, 2, 3, 4, 5, 6] # a=1, c=6print(a) # a=1, c=6print(c) # a=1, c=6a, b, *_ = [1, 2, 3, 4, 5, 6]print(a) # a=1print(b) # b=2# 一行代码搞定两个变量交换赋值x = 10y = 20x, y = y, xprint(x) # x = 20print(y) # y = 10
Original: https://www.cnblogs.com/zengmuyao/p/16353664.html
Author: 以小博大
Title: python拆包和封包
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