class cls0():
x = 0
class cls1(cls0):
z = 1
class cls2():
x =4
class cls3(cls1,cls2):
y = 1
obj = cls1()
def getcls(cls,indent):
print("." * indent + cls.__name__)
for c in cls.__bases__:
getcls(c,indent+2)
getcls(cls3,2)
..cls3
....cls1
......cls0
........object
....cls2
......object