原理
浅拷贝importcopy
b= copy.copy(a)
demo：
>>> a=[1,['a']]>>> b=a>>> c=copy.copy(a)>>>a
[1, ['a']]>>>b
[1, ['a']]>>>c
[1, ['a']]>>>id(a)140556196249680
>>>id(b)140556196249680
>>>id(c)140556298139120
>>> a[0]=2
>>>a
[2, ['a']]>>>c
[1, ['a']]>>>a[1].append('b')>>>a
[2,['a','b']]>>>c
[1,['a','b']]
深拷贝importcopy
b= copy.deepcopy(a)
demo:
>>> a=[1,2,['a','b']]>>> b=copy.deepcopy(a)>>>a
[1, 2, ['a','b']]>>>b
[1, 2, ['a','b']]>>>id(a)140556196175952
>>>id(b)140556196501336
>>>id(a[0])11961144
>>>id(b[0])11961144
>>> id(a[2])140556196424448
>>> id(b[2])140556196250472
>>> a[0]=3
>>> a[2].append('c')>>>a
[3, 2, ['a','b','c']]>>>b
[1, 2, ['a','b']]