What you will learn
- Understand class, object, attribute, and method.
- Use
__init__()to initialize an object. - Understand self at a practical level.
- Build a small class without diving into advanced OOP theory.
The code from this chapter
Type these programs yourself. The predictions below are the exercises; the explanations are in the book.
13.2 Your First Class
TPRM Lab 13.2: Create a Player
Type this into a file, predict the output, then run it.
class Player:
def __init__(self, name, score=0):
self.name = name
self.score = score
def add_points(self, points):
self.score += points
player1 = Player("Alex")
player1.add_points(10)
player1.add_points(5)
print(player1.name)
print(player1.score)13.3 __init__ Sets the Starting State
Type this into a file, predict the output, then run it.
class Product:
def __init__(self, name, price):
self.name = name
self.price = price
def sale_price(self, percent_off):
return self.price * (1 - percent_off / 100)
book = Product("Python the TPRM Way", 19.99)
print(f"{book.sale_price(20):.2f}")