class P1:
def foo(self):
print 'called P1-foo()'
class P2:
def foo(self):
print 'called P2-foo()'
def bar(self):
print 'called P2-bar()'
class C1(P1, P2):
pass
class C2(P1, P2):
def bar(self):
print 'called C2-bar()'
class GC(C1, C2):
pass
# issubclass() determines if one class is a subclass or descendant of another class.
# It has the following syntax: issubclass(sub, sup)