Python pass 语句
定义和用法
The pass 语句用作将来代码的占位符。
当 pass 语句被执行时，什么也不会发生，但可以避免在不允许空代码的情况下出现错误。
空代码不允许出现在循环、函数定义、类定义或 if 语句中。
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