Logical Operators

Logical Operators return boolean result which makes them suitable for if statements.

Operator	Description	Examples	Result
not	Inverse the value.	not True	False
		not False	True
		not (2 + 3 == 5)	False
and	True if all statements are True. False - if one or more statements are False.	True and True and True	True
		False and False and False	False
		True and False	False
or	True if one or more statements are True. False - if all statements are False.	True or True or True	True
		False or False or False	False
		True or False	True

Example

Let's look at the following example. Depending on a test score, determine whether the score is low, medium, high or invalid following these rules:

• 0 to 50 - low
• 51 to 75 - medium
• 76 to 100 - high
• less than 0 or more than 100 - invalid

score = 80 if score >= 0 and score <= 50: print("low") if score >= 51 and score <= 75: print("medium") if score >= 76 and score <= 100: print("high") if score < 0 or score > 100: print("invalid")

Output:

high

Explanation:

• To check whether a number is between 2 values and operator can be used.
• Line 3 checks whether number is greater or equal to 0 and if it's less or equal to 50.
• Line 12 checks whether number is less than 0 or if it's greater than 100.