python_calss_type_study.py

class Class1():
    pass

class Class2():
    pass

class Class3(object):
    pass

a = Class1()
b = Class1()
assert True == isinstance(a, type(b))
assert True == isinstance(b, type(a))

c = Class2()
assert True == isinstance(c, type(a))

d = Class3()
assert False == isinstance(d, type(a))
assert False == isinstance(d, type(c))
assert False == isinstance(a, type(d))
assert False == isinstance(c, type(d))

print "tipo de a " + str(type(a))
print "tipo de d " + str(type(d))

#more info here: http://stackoverflow.com/questions/54867/old-style-and-new-style-classes-in-python
#and here: http://stackoverflow.com/questions/332255/difference-between-class-foo-and-class-fooobject-in-python