Dragon Realm - Invent Your Own Computer Games with Python - page 64

Truth Tables

If you ever forget how the boolean operators work, you can look at these charts, which
are called truth tables :

Table 6-1: The and operator's truth table.
A

and B is Entire statement

True and True is True

True and False is False

False and True is False

False and False is False

Table 6-2: The or operator's truth table.

A or B is Entire statement

True or True is True

True or False is True

False or True is True

False or False is False

Table 6-3: The not operator's truth table.
not A is Entire statement

not True is False

not False is True

Getting the Player's Input

14. print('Which cave will you go into? (1 or 2)')
15. cave = input()

Here, the player is asked to enter which cave they chose to enter by typing in 1 or 2 and
hitting Enter. Whatever string the player typed will be stored in cave . After this code is
executed, we jump back to the top of the while statement and recheck the condition.
Remember that the line was:

13. while cave != '1' and cave != '2':

If this condition evaluates to True , we will enter the while-block again and ask the
player for a cave number to enter. But if the player typed in 1 or 2, then the cave value
will either be '1' or '2' . This causes the condition to evaluate to False , and the