Why do two Python objects share one list? Learn how class attributes cause this bug, why += hides it, and how to fix it with ...
刚入门 Python 后台开发的人，十个里大概有八个会被 ModuleNotFoundError: No module named 'psycopg2' 卡过。 我自己早年调一个订单导出功能时也踩过这个坑，第一反应是赶紧 pip install psycopg2 补包，结果安装过程中又刷出一大串编译错误，当时整个人是崩溃的。
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