x = 10
y = x
print('x= {0}'.format(x) )
print('memory address of x : {0}'.format(id(x)))
print('y= {0}'.format(y) )
print('memory address of y : {0}'.format(id(y)))
x=11
print(x)
print('x-= {0}'.format(x) )
print('memory address of x : {0}'.format(id(x)))