字典遍历过程中修改字典元素，报错 RuntimeError: dictionary changed size during iteration

字典遍历过程中修改字典元素，报错 RuntimeError: dictionary changed size during iteration

https://blog.csdn.net/u013344884/article/details/81867225
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原文地址：https://www.cnblogs.com/come202011/p/12432224.html