1.

class Course:
    def __init__(self, title, instructor, lectures, price):
        self.title = title
        self.instructor = instructor
        self.price = price
        self.lectures = lectures
        self.users = []
        self.ratings = 0
        self.avg_rating = 0
        
    def __str__(self):
        return f'{self.title} by {self.instructor}'
    
    def new_user_enrolled(self, user):
        self.users.append(user)

    def received_a_rating(self, new_rating):
        self.avg_rating = (self.avg_rating * self.ratings + new_rating)/(self.ratings + 1)
        self.ratings += 1 

    def show_details(self):
        print('Course Title : ', self.title)
        print('Intructor : ', self.instructor)
        print('Price : ', self.price)
        print('Number of Lectures : ', self.lectures)
        print('Users : ', self.users)
        print('Average rating : ', self.avg_rating)


class VideoCourse(Course):
        def __init__(self,title,instructor,lectures,price,length_video):
        super().__init__(title,instructor,lectures,price)
        self.length_video = length_video

    def show_details(self):
        super().show_details()
        print('Video Length : ',  self.length_video)
        
        
class PdfCourse(Course):
    def __init__(self,title,instructor,lectures,price,pages):
        super().__init__(title,instructor,lectures,price)
        self.pages = pages

    def show_details(self):
        super().show_details()
        print('Number of pages : ',  self.pages)


vc = VideoCourse('Learn C++', 'Jack', 30, 50, 10)
vc.new_user_enrolled('Allen')
vc.new_user_enrolled('Max')
vc.new_user_enrolled('Tom')
vc.received_a _rating(3)
vc.received_a _rating(5)
vc.received_a _rating(4)
vc.show_details()

print()

pc = PdfCourse('Learn Java', 'Jim', 35, 50, 1000)
pc.new_user_enrolled('Allen')
pc.new_user_enrolled('Mary')
pc.new_user_enrolled('JIm')
pc.received_a_rating(5)
pc.received_a_rating(4)
pc.received_a_rating(4.5)
pc.show_details()

2.

Can cook noodles

Can cook pasta

Can cook butter chicken

3.

I am a Person

I am a Student

I am a Teaching Assistant

4.

This is the output that we get.

2675T

4567S

3421T

5749

Using the base class names can cause real bugs in multiple inheritance. If we use super, the problem will not occur.

class Person:
    def __init__(self,id):
        self.id = id
        
class Teacher(Person):
    def __init__(self,id):
        super().__init__(id)
        self.id += 'T'
    
class Student(Person):
    def __init__(self,id):
        super().__init__(id)
        self.id += 'S'
   
class TeachingAssistant(Student, Teacher):
     def __init__(self,id):
        super().__init__(id)
        
   
x = TeachingAssistant('2675')
print(x.id)
y = Student('4567')
print(y.id)
z = Teacher('3421')
print(z.id)
p = Person('5749')
print(p.id)

Output:

2675TS

4567S

3421T

5749