class Foo(object):
    pass

class Bar(Foo):
    pass

obj = Bar()

# isinstance用于判断，对象是否是指定类或其派生类的实例
print(isinstance(obj,Foo)) #True
print(isinstance(obj,Bar))#True

#精确的判断对象是否是指定类的实例
print(type(obj) == Bar) #True
print(type(obj) == Foo) #False