Python Logical Operators

What Are Logical Operators in Python?

Logical operators in Python are keywords that allow you to combine or modify conditional expressions and evaluate whether the overall condition is True or False. These operators are essential for decision-making and controlling the flow in your programs.

Types of Logical Operators

Python has three main logical operators:

How Logical Operators Work (Input & Output)

1. Logical AND (and)

Returns True only if all conditions are True

print(True and True) print(True and False) print(5 > 3 and 2 < 4) # Output: # True # False # True

• True and True → True

• If any condition is False, the result is False.

2. Logical OR (or)

Returns True if at least one condition is True

print(True or False) print(False or False) print(5 > 10 or 2 < 4) # Output: # True # False # True

• True or False → True

• Only False or False → False.

3. Logical NOT (not)

Reverses the truth value:

print(not True) print(not False) print(not (5 > 10)) # Output: # False # True # True 

• not True becomes False

• not False becomes True.

Using Logical Operators with Variables

age = 18 has_id = True print(age >= 18 and has_id) print(age < 18 or has_id) print(not (age < 18)) # Output: # True # True # True 

and, or, and not help combine multiple boolean expressions.

Short-Circuit Evaluation

Python uses short-circuit logic with and and or, meaning evaluation stops as soon as the result is determined:

• For and: if the first condition is False, Python doesn’t evaluate the second.

• For or: if the first condition is True, Python doesn’t evaluate the second.

This behavior can improve performance and avoid unnecessary evaluation.

Logical Operators in Conditional Statements

Logical operators are often used in if statements

temp = 25 is_sunny = True if temp > 20 and is_sunny: print("Perfect day for a walk!") # Output: # Perfect day for a walk! 

This runs the print statement only if both conditions are True.

Truth Table