In Python (and in many programming languages), we can use these values:
true = True
false = False
Conditions (such as comparisons between numbers) return a boolean value:
print(5 > 3) # True
print(2 == 4) # False
Main logical operators
There are three fundamental logical operators in Boolean logic:
- AND (
and): All conditions must be true
Example:True and False → False - OR (
or): At least one condition must be true
Example:True or False → True - NOT (
not): Reverses the value (true becomes false, and vice versa)
Example:not True → False
Practical examples
a = 5
b = 10
print(a > 0 and b < 20) # True
print(a > 0 or b > 100) # True
print(not (a > 3)) # False
Where is Boolean logic used?
- In programs, to make choices (if/else)
- In search engines, to combine keywords
- In electronic circuits, to turn components on or off
- In games, to decide what happens if a player wins or loses
Exercise
Try to say if these expressions are True or False:
7 > 3 and 2 == 2 → _______
10 < 5 or 3 > 1 → _______
not (4 <= 4) → _______
