CODEWITHSUNDEEP
pythonclass
Ludwig
Ludwig

Reputation: 157

Printing from different class

I've searched for similar questions, and have not found anything. Apparently because my question is pretty basic, yet I find it hard to understand.

I have a class named Student. In this class I get a name of student, and his grades then calculate his average grade. That one was easy, of course. Here's what I've succeed so far:

class Student:
    def __init__(self, name, grades_list):
        self.name = name
        self.grades_list = grades_list

    def get_grade_avg(self):
        avg = sum(self.grades_list) / len(self.grades_list)
        return avg

    def get_name(self):
        return self.name

From the previous part I have:

john = Student("John", [100, 90 ,95])

Now I need to answer the following qeustion:

Write a class ClassRoom which has a constructor that receives a list of type Student, and saves this list to a member. The following should create a class room:

class_room = ClassRoom([John])

Implement class ClassRoom such that when calling print(class_room) on a ClassRoom type prints a list of tuples of student name and student grade average, in that order.

Calling print(class_room) should output:

[('John', 95)]

How do I do it?

I'm very new to OOP and have no idea even how to start.

Thank you!

Upvotes: 0

Views: 112

Answers (2)

sahinakkaya
sahinakkaya

Reputation: 6056

You can do it like this:

class Student:
    ...
    def __repr__(self):
        return str((self.name, self.get_grade_avg()))


class ClassRoom:
    def __init__(self, students):
        self.students = students

    def __str__(self):
        return str(self.students)

john = Student("John", [100, 90 ,95])
mike = Student("Mike", [90, 80, 85])
c = ClassRoom([john, mike])
print(c)

# [('John', 95.0), ('Mike', 85.0)]
print(c)

When you call print on some object its __str__ method is invoked and if it is not defined __repr__ is called. By default __repr__ of some object is something like this: <__main__.Student object at 0x7f4b35a3a630>

In the above code a Student knows how to show itself, (name, avg), so you can print it if you like: print(john)

And for your ClassRoom, you just need to override __str__ to show the student list. Since every student knows how to show itself, it will do the job.

Upvotes: 1

Yitshak Yarom
Yitshak Yarom

Reputation: 84

you need to add str() function to both class and student classes. str() if class should iterate over the list of students and print them on by one.

Upvotes: 1

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