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Logical Operators in Python with Examples

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Operators are used to perform operations on values and variables. These are the special symbols that carry out arithmetic and logical computations. The value the operator operates on is known as the Operand.

In this article, we will discuss logical operators in Python definition and also look at some Python logical operators programs, to completely grasp the concept.

Logical operators in Python

In Python, Logical operators are used on conditional statements (either True or False). They perform Logical AND, Logical OR, and Logical NOT operations.

OPERATORDESCRIPTIONSYNTAXExample
andReturns True if both the operands are truex and yx>7 and x>10
orReturns True if either of the operands is truex or yx<7 or x>15
notReturns True if the operand is falsenot xnot(x>7 and x> 10)

Truth Table for Logical Operators in Python

Truth Table for Python Logical Operators

Logical AND operator in Python

The logical AND operator returns True if both the operands are True else it returns False. Python-logical-and-operator2

Logical AND operator in Python Examples:

Let’s look at some Python AND operator programs, and understand the workings of AND operator.

Example 1:

Python3

# Python program to demonstrate
# logical and operator
a = 10
b = 10
c = -10
if a > 0 and b > 0:
    print("The numbers are greater than 0")
if a > 0 and b > 0 and c > 0:
    print("The numbers are greater than 0")
else:
    print("Atleast one number is not greater than 0")

                    

Output

The numbers are greater than 0
Atleast one number is not greater than 0

Example 2: 

Python3

# Python program to demonstrate
# logical and operator
a = 10
b = 12
c = 0
if a and b and c:
    print("All the numbers have boolean value as True")
else:
    print("Atleast one number has boolean value as False")

                    

Output

Atleast one number has boolean value as False

Note: If the first expression is evaluated to be false while using the AND operator, then the further expressions are not evaluated.

Logical OR operator in Python

Logical OR operator returns True if either of the operands is True. Python-logical-or-operator

Logical OR operator in Python Examples

Let’s look at some Python OR operator program to understand it’s workings 

Example 1: 

Python3

# Python program to demonstrate
# logical or operator
a = 10
b = -10
c = 0
if a > 0 or b > 0:
    print("Either of the number is greater than 0")
else:
    print("No number is greater than 0")
if b > 0 or c > 0:
    print("Either of the number is greater than 0")
else:
    print("No number is greater than 0")

                    

Output

Either of the number is greater than 0
No number is greater than 0

  Example 2: 

Python3

# Python program to demonstrate
# logical and operator
a = 10
b = 12
c = 0
if a or b or c:
    print("Atleast one number has boolean value as True")
else:
    print("All the numbers have boolean value as False")

                    

Output

Atleast one number has boolean value as True

Note: If the first expression is evaluated to be True while using or operator, then the further expressions are not evaluated.

Logical NOT operator in Python

The logical not operator works with a single boolean value. If the boolean value is True it returns False and vice-versa. Python-logical-not-operator

Logical NOT operator in Python Examples

Let’s look at this Python NOT operator program to understand its working. 

Example: 

Python3

# Python program to demonstrate
# logical not operator
a = 10
 
if not a:
    print("Boolean value of a is True")
if not (a%3 == 0 or a%5 == 0):
    print("10 is not divisible by either 3 or 5")
else:
    print("10 is divisible by either 3 or 5")

                    

Output

10 is divisible by either 3 or 5

Order of Precedence of Logical Operators

In the case of multiple operators, Python always evaluates the expression from left to right. We can verify Python logical operators precedence by the below example. 

Example: 

Python3

# Python program to demonstrate
# order of evaluation of logical
# operators
def order(x):
    print("Method called for value:", x)
    return True if x > 0 else False  
a = order
b = order
c = order
if a(-1) or b(5) or c(10):
    print("Atleast one of the number is positive")

                    

Output

Method called for value: -1
Method called for value: 5
Atleast one of the number is positive

Read Other Python Operators



Last Updated : 27 Dec, 2023
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