python入门之深浅copy

a1=["a","b","c","aa"]
b1=a1
a1[0]="1"
print(a1,b1)
此时结果为：
a1=["1","b","c","aa"]
b1=["1","b","c","aa"]

当两个列表赋值想等的话，改变其中一个列表里的元素，另一个列表中的元素也会随之变化。

a1=["a","b","c","aa"]
c1=a1.copy()
a1[0]="1"
print(a1,c1)
此时结果为：
a1=["1","b","c","aa"]
b1=["a","b","c","aa"]

a1=["a","b","c","aa"，["gaohui",21]]
d1=a1.copy()
a1[-1][0]="hong"
print(a1,d1)
此时结果为：
a1=["a","b","c","aa"，["hong",21]]
d1=["a","b","c","aa"，["gaohui",21]]

浅copy：
     1.是把列表本身独立，里面的元素是被两个列表共享的
     2.当其中一个列表中的元素被改变时，另一个列表中的元素不会随之变化。
     3.当列表里面还有列表时，修改内部列表的内容时，另一个列表中的内部列表也会随之变化

深copy：
      import copy
      列表=copy.deepcopy(列表)
当用到深copy时，两个列表的所有内容都是独立的，没有任何关系。