Summary - Classes

Combine attributes and methods to write a User class.

Summary - Classes

In this group you learned to define a class in Python, add attributes, write methods, set up instances with the constructor (__init__), and finally produce human readable output with __str__.

A class starts with class, the body is indented after a colon. __init__ runs when an instance is created; self points to the instance. __str__ is called by print. Now we will combine these into one class.

Exercise Combine the Student class

Define a class named Student. Add def __init__(self, name): and write self.name = name in the body. Add def __str__(self): and write return f"Student: {self.name}". Then create an instance with s = Student("Dana") and write print(s).

Show example solution

# Define the Student class with __init__ and __str__
class Student:
    def __init__(self, name):
        self.name = name
    def __str__(self):
        return f"Student: {self.name}"

s = Student("Dana")
print(s)

Test yourself

In which order should we proceed?
- __str__ → class → __init__
- class → __init__ → __str__
- __init__ → __str__ → class
- __str__ → __init__ → class
Show answer

class → __init__ → __str__ — First the class skeleton, then __init__, last __str__.
Match the concepts

class

Template definition
__init__

Constructor
__str__

Readable output

Complete the constructor body

class Student:
    def __init__(self, name):
        ____ = name

Show answer

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

Next lesson: Inheritance basics

We Are Enhancing Your Experience

Cookie Preferences

Strictly Necessary Cookies

Analytical Cookies