>>> a

 [1, 2]

 >>> b=a[:]

 >>> b

 [1, 2]

 >>> b[0]=20

 >>> b

 [20, 2]

 >>> a

 [1, 2]

 import copy

 >>> c=copy.copy(a)

 >>> c

 [1, 2]

 >>> c[1]=30

 >>> c

 [1, 30]

 >>> a

 [1, 2]

 >>> b

 [20, 2]

 1 >>> a=[('he',1),('wo','jia')]

 2 >>> p=dict(a)

 3 >>> p

 4 {'wo': 'jia', 'he': 1}

 5 >>> b=p.copy()

 6 >>> b

 7 {'wo': 'jia', 'he': 1}

 8 >>> b['wo']='ja'

 9 >>> b

10 {'wo': 'ja', 'he': 1}

11 >>> p

12 {'wo': 'jia', 'he': 1}