Chapter 23
Writing Classes
No programming language can anticipate all data types that a programmer
might eventually need, and so object-oriented languages allow you to create
new data types by defining classes. We start with a simple example to highlight
the new concepts.
Listing 23.1: Sum of Dice
1 # dicesum.py
2
3 from random import randint
4
5 class Die:
6 def __init__(self):
7 self.roll()
8
9 def roll(self):
10 self.value = randint(1, 6)
11
12 def __str__(self):
13 return str(self.value)
14
15 def main():
16 rolls = int(input("Enter the number of times to roll: "))
17 die1 = Die()
18 die2 = Die()
19 counts = [0]
*
13
20 for i in range(rolls):
21 die1.roll()
22 die2.roll() ...
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