Name Error: OO programming

[Pythonhelp82]

I have coded this example from a course textbook (it says it is a working example), When I run the code, it is coming with a Name Error, Assessment not defined.

I have played around with the code but with no luck. Can anyone please help me correct the error? (I have followed the book line by line).

class Course:
    def __init__(self,t,m):
        
        self.__CourseTitle=t
        self.__MaxStudents=m
        self.__NumberOfLessons=0
        self.__CourseLesson=[]
        self.__CourseAssessment=Assessment


    def AddAssessment(self,t,m):
        self.__CourseAssessment=Assessment(t,m)

    def AddLesson(self,t,d,r):
        self.__NumberOfLessons=self.__NumberOfLessons+1
        self.__CourseLesson.append(Lesson(t,d,r))

    
        
    def OutputCourseDetails(self):
        print(self.__CourseTitle,"Maximum Number: ",self.__MaxStudents)
        for i in range(self.__NumberOfLessons):
            print(self.__CourseLesson[i].OutputLessonDetails())

    
MyCourse=Course("Computing",10)

MyCourse.AddAssessment("Programming",100)
MyCourse.AddLesson("Problem Solving",60,False)
MyCourse.AddLesson("Programming",120,True)
MyCourse.AddLesson("Theory",60,False)



MyCourse.OutputCourseDetails()

[Yoriz]

Your code has not defined Assessment neither has it defined Lesson look in the course textbook for where thse are defined and add them to your code.

[Pythonhelp82]

I realized my mistake, I had to create the Assessment and Lesson classes which was an additional task.

thank you!