建议检查一下自己的代码

class Person(object):

    def __init__(self, name, gender):

        self.name = name

        self.gender = gender

class Student(Person):

    def __init__(self, name, gender, score):

        super(Student, self).__init__(name, gender)

        self.score = score

class Teacher(Person):

    def __init__(self, name, gender, course):

        super(Teacher, self).__init__(name, gender)

        self.course = course

p = Person('Tim', 'Male')

s = Student('Bob', 'Male', 88)

t = Teacher('Alice', 'Female', 'English')

print(isinstance(p, Person))

print(isinstance(p, Student))

print(isinstance(p, Teacher))

print(isinstance(p, object))

t=Person('a','a')是没错的 

class Person:

    def __init__(self, name, gender):

        self.name = name

        self.gender = gender

class Student(Person):

    def __init__(self, name, gender, score):

        super(Student, self).__init__(name, gender)

        self.score = score

class Teacher(Person):

    def __init__(self, name, gender, subject):

        super(Teacher, self).__init__(name, gender)

        self.subject = subject

p = Person('Tim', 'male')

s = Student('Lily', 'Female', 88)

t = Teacher('Changyun', 'Female', 'English')

isinstance(t, Person)

isinstance(t, Teacher)

isinstance(t, Student)

print(isinstance(t, object))

不会报错啊