Logical Operators in Python

In this tutorial we are going to learn :

Logical Operators
And Operator
Or Operator
Not Operator
Chaining Comparison
Operators

Logical Operators

In Python, we use some logical operators to combine conditional statements. These
are :

and : Returns True if both statements are true
or : Returns True if either of statements is true
not : Returns True if statement is false

And Operator

And operator returns True if both statements are true.

Example :

In this program, If the weather is the weather is rainy and cold, the program is going to print “Don’t go outside. ” and otherwise the program will print ” You can go outside.“

We set rainy_weather and cold_weather True
Both statements are True, the and operator is going to run.

rainy_weather = True
cold_weather = True
emergency = True

if rainy_weather and cold_weather:
    print("Don't go outside ")
    
else:
    print("You can go outside. ")
print("Done.")

In the same program :

Let’s set rainy_weather False and cold_weather True.
One of the statements is False. the and operator is not going to run.

rainy_weather = False
cold_weather = True
emergency = True

if rainy_weather and cold_weather:
    print("Don't go outside ")
    
else:
    print("You can go outside. ")
print("Done.")

Or Operator

Or operator returns True if either of statements is true.

Example :

In this same program, we used or operator instead of and operator.
rainy_weather is False and cold_weather is True. One of the statements is True
so or operator is going to run.

rainy_weather = False
cold_weather = True
emergency = True

if rainy_weather or cold_weather:
    print("Don't go outside ")
    
else:
    print("You can go outside. ")
print("Done.")

Not Operator

Not operator returns True, the if statement is false.

Example :

In the same program, we used and , or , not operators together.

All variables are True.
emergency is True but we set it with not operator then and operator. So if

statement is not going to run.

rainy_weather = True
cold_weather = True
emergency = True

if ()rainy_weather or cold_weather) and not emergency:
    print("Don't go outside ")
    
else:
    print("You can go outside. ")
print("Done.")

Chaining Comparison Operators

Example :

We don’t need to use and operator like this :

We have a better way to do this :

age = 23

if 18 <= age < 60:
    print("Approved. ")