copy python

1import copy
2
3new_ob = copy.deepcopy(old_ob)

1>>> import copy
2>>> nums = [1, 2, 3]
3>>> data = {'a': 10, 'b': nums}
4>>> data
5{'a': 10, 'b': [1, 2, 3]}
6>>> data_copy = copy.copy(data)
7>>> data_deep = copy.deepcopy(data)
8>>> data_copy
9{'a': 10, 'b': [1, 2, 3]}
10>>> data_deep
11{'a': 10, 'b': [1, 2, 3]}
12>>> data_copy['a'] += 2
13>>> nums[1:1] = [254]
14>>> data
15{'a': 10, 'b': [1, 254, 2, 3]}
16>>> data_copy
17{'a': 12, 'b': [1, 254, 2, 3]}
18>>> data_deep
19{'a': 10, 'b': [1, 2, 3]}

1new_list = list.copy()
2
3# returns a new list without modifying the orginal list. 

1a=[1,2,3,4]
2b=a[:] 
3''' now b has all elements of  a'''