Write a program to implement composition

file.py

class A:
 def __init__(self):
 print('Class - A Contructor')
 def m1(self):
 print('M1 method of Class - A.')
class B:
 def __init__(self):
 print('Class - B Constructor.')
 def m2(self):
 obj = A()
 obj.m1()
 print('M2 method of Class - B.')
obj = B()
obj.m2()

output:

Output

Class - B Constructor.
Class - A Contructor
M1 method of Class - A.
M2 method of Class - B.