python里的引用、浅拷贝、深拷贝

 

参考：

1、http://wsfdl.com/python/2013/08/16/%E7%90%86%E8%A7%A3Python%E7%9A%84%E6%B7%B1%E6%8B%B7%E8%B4%9D%E5%92%8C%E6%B5%85%E6%8B%B7%E8%B4%9D.html

2、https://morvanzhou.github.io/tutorials/python-basic/basic/13-04-copy/

3、https://docs.python.org/3/library/copy.html