Can someone tell why calc is not printing?

Question

https://code.sololearn.com/czWH4Z14avqw/?ref=app

Answer 1

calc() is not a class method, by default it is an instance method. That means you need to create an instance of your Rttu class, giving the argument required by the __init__ constructor. Then you can call the calc() method of that instance. Like so:

r = Rttu('my name')
r.calc()

Answer 2

square = Rectangle.new_square(5)
print(square.calculate_area())

This is instantiation. You create an instance of the class Rectangle. Notice, to call the calc function you used the instance name and not the class name, so:
square.calculate_area()
and NOT: Rectangle.calculate_area()
That's why it works.

Answer 3

Thanks Tibor Santa

Answer 4

But in calculating area,the same method is used to call the class functions and it's working fine,why is that?
By the way thanks for answering.