闭包
闭包就是能够读取其他函数内部变量的函数。
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def test1(k, b): def test1_1(x): print(k*x+b) return test1_1t1 = test1(1, 2)t1(0)t1(1)t1(2) |
闭包中修改数据
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x = 300def test1(): x = 200 def test2(): nonlocal x print("----1----x = {}".format(x)) x = 100 print("----2----x = {}".format(x)) return test2t1 = test1()t1() |
装饰器
实现对无参数函数的装饰器
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def set_func(func): def call_func(): print("装饰器执行") func() return call_func@set_func # 等价于sumNum = set_func(sumNum)def sumNum(): print("sumNum")sumNum() |
实现对有参数函数的装饰器
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# 对有参数、无返回值的函数进行装饰def set_func(func): def call_func(num): print("装饰器") func(num) return call_func@set_funcdef sumNum(num): print("sumNum = {}".format(num))sumNum(100) |
对不定长参数的函数进行装饰
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def set_func(func): def call_func(*args, **kwargs): print("装饰器") func(*args, **kwargs) # 拆包 return call_func@set_funcdef sumNum(num, *args, **kwargs): print("sumNum = {}".format(num)) print("args = {}".format(args)) print("kwargs = {}".format(kwargs))sumNum(100, 200, c=100) |
对有返回值的函数进行装饰
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def set_func(func): def call_func(*args, **kwargs): print("装饰器") return func(*args, **kwargs) # 拆包 return call_func@set_funcdef sumNum(num, *args, **kwargs): print("sumNum = {}".format(num)) print("args = {}".format(args)) print("kwargs = {}".format(kwargs)) return "200 ok"sumNum(100, 200, c=100) |
多个装饰器对同一个函数装饰
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def add_h1(func): def h1(): h1_str = "<h1>" + func() + "</h1>" return h1_str return h1def add_a(func): def call_func(): a_str = "<a>" + func() + "</a>" return a_str return call_func@add_h1@add_adef get_str(): return "haha"get_str() |
输出为：<h1><a>haha</a></h1>
总结
本篇文章就到这里了，希望能够给你带来帮助，也希望您能够多多关注服务器之家的更多内容!
原文链接：https://blog.csdn.net/weixin_43670190/article/details/122916070
