need explnation for below code

Question

Dear support,
kindly help me to understand below code

import copy
a=[1,[2,3]]
b=copy.deepcopy(a)
print(b)
b=copy.copy(a)
print(b)
a[0]=3
print(b)
a[1][1]=5
print(b)
b=copy.copy(a)
print(b)

Answer 1

'deepcopy' creates a new deep copy of an object, and 'copy.copy' creates a shallow copy. In the case of a shallow copy the nested list will not be cloned and the result will have the same identical nested list. In the case of a deep copy the nested list will be cloned too, so a new list will be created with new nested lists too.
Look at https://docs.python.org/3/library/copy.html