Estimated time

30-60 minutes

Level of difficulty

Medium

Objectives

• improving the student's skills in operating with special methods

Scenario

• Create a class representing a time interval;
• the class should implement its own method for addition, subtraction on time interval class objects;
• the class should implement its own method for multiplication of time interval class objects by an integer-type value;
• the __init__ method should be based on keywords to allow accurate and convenient object initialization, but limit it to hours, minutes, and seconds parameters;
• the __str__ method should return an HH:MM:SS string, where HH represents hours, MM represents minutes and SS represents the seconds attributes of the time interval object;
• check the argument type, and in case of a mismatch, raise a TypeError exception.