a=20
b=20
if(a is b):
    print"line 1 - a and b have same identity"
else:
    print"line 1 - a and b do not have same identity"
if(id(a)==id(b)):
    print"line 2 - a and b have same identity"
else:
    print"line 2 - a and b do not have same identity"
b=30
if(a is b):
    print"line 3 - a and b have same identity"
else:
    print"line 3 - a and b do not have same identity"
if(a is not b):
    print"line 4 - a and b do not have same identity"
else:
    print"line 3 - a and b have same identity"


