python-13 闭包、nonlocal、默认值和LEGB、匿名函数

闭包 #F44336

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内部函数用到了外部函数的自由变量，就形成了闭包

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nonlocal语句

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默认值的作用域

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.__defaults__ 记录当前缺省值

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__defaults__ 可以修改

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引用类型缺省值
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非引用类型缺省值
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keyword-only参数的缺省值

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不可变类型 += ，地址修改，覆盖
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可变类型 +=，地址不变，就地修改
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变量名解析原则LEGB #F44336

外层的变量向内层可见(向内层穿透)，内层函数的局部变量在外层不可见，内层没有向外找 “就近原则”。

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函数的销毁

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匿名函数

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sorted

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{x for x in (lambda *args: map(lambda x:x+1 ,args))(*range(5))}  # 高阶函数
{x for x in (lambda *args: map(lambda x:(x+1,args) ,args))(*range(5))} 
(lambda x:list(x))(range(5))
posted @ 2022-04-20 18:14  何时&明月  阅读(69)  评论(0)    收藏  举报