Python作用域（LEGB规则）

Python中的LEGB规则 - 郭娅祥 - 博客园
https://www.cnblogs.com/GuoYaxiang/p/6405814.html

 

Python LEGB规则 - 简书
https://www.jianshu.com/p/3b72ba5a209c

 

谈谈自己的理解:python中闭包，闭包的实质 - 稀里糊涂林老冷 - 博客园
https://www.cnblogs.com/Lin-Yi/p/7305364.html

 

LEGB规则 - FooFish-Python之禅
http://foofish.net/python-legb.html

 

3.6 函数进阶 · Python全栈开发之路
https://www.luffycity.com/python-book/di-3-zhang-python-ji-chu-2014-wen-jian-cao-4f5c26-han-shu/36-han-shu-jin-jie.html