Python 全局范围
全局范围
在 Python 代码的主体中创建的变量是全局变量，属于全局范围。
全局变量在任何范围内（全局和局部）都可用。
命名变量
如果您在函数内部和外部使用相同的变量名称，Python 将把它们视为两个独立的变量，一个在全局范围内（函数外部）可用，另一个在局部范围内（函数内部）可用。
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