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                ## 工廠函數 工廠函數有時也叫閉合(closure),他能夠記住嵌套作用域變量值的函數,盡管那個作用域已經不存在了。 ```python def maker(N): def action(X): return X ** N return action ``` f = maker(2) --> 此處f記住了N = 2 --> f(3) = 9 工廠函數每次調用都得到了自己狀態信息的集合。 ### 使用默認參數來保留嵌套作用域的狀態 函數定義時盡量避免嵌套,可以使用第2種方法,結構更明確 ```python def f1(): x = 88 def f2(x=x): print(x) f2() ``` f1() 打印 88 **應轉化為** ```python def f1(): x = 88 f2() def f2(x): print(x) ```
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