Python 局部作用域
变量只能在其创建的区域内使用。这称为 **作用域**。
局部作用域
在函数内部创建的变量属于该函数的 *局部作用域*，并且只能在该函数内部使用。
函数内部的函数
如上例所示，变量 x 在函数外部不可用，但在函数内部的任何函数中都可用
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