Logical operators in python with example

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 Operand.

Table of Content

• Logical operators
  • Logical AND operator
  • Logical OR operator
  • Logical NOT operator
• Order of evaluation of logical operators

Logical operators

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

Logical AND operator

Logical operator returns True if both the operands are True else it returns False.

Example #1:

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:

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 evaluated to be false while using and operator, then the further expressions are not evaluated.

Logical or operator

Logical or operator returns True if either of the operands is True.

Example #1:

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:

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 evaluated to be True while using or operator, then the further expressions are not evaluated.

Logical not operator

Logical not operator work with the single boolean value. If the boolean value is True it returns False and vice-versa.

Example:

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 evaluation of logical operators

In the case of multiple operators, Python always evaluates the expression from left to right. This can be verified by the below example.

Example:

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

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