cp7.py

from copy import copy
x=[1,2,[3,4]]
#Copying x
y=copy(x)

#Modifying elemets in the outer list
#Changes are not reflected in the copied list
x[0]=99
print (x)#Output:[99, 2, [3, 4]]
print (y)#Output:[1, 2, [3, 4]]

#Modifying elements in the nested list.
#Changes are reflected in the copied list also.
x[2][0]=5555
print (x)#Output:[99, 2, [5555, 4]]
print (y)#Output:[1, 2, [5555, 4]]