class Box:
length=0
breadth=0
def change(self,box1):
box1.length=box1.length*2;
box1.breadth=box1.breadth*2
return box1
b1= Box()
b1.length=100
b1.breadth=50
b2=Box()
boxChanged=b2.change(b1)
print("changed length= ",boxChanged.length ," changed breadth=",boxChanged.breadth)