Last modified: October 07, 2021

How to Properly Check if a Variable is Not Null in Python

In this tutorial, I will show you how to check if a variable is empty in different methods.

note: Python programming uses None instead of null.

1. Checking if the variable is not null [Method 1]

Syntax:


variable is not None

Example:


#variable
var = "hello python"

#check is not null
if var is not None:
    print('Var is not null')

output

Var is not null

2. Checking if the variable is not null [Method 2]


#variable
var = "hello python"

#check is not null
if var:
    print('Var is not null')

output

Var is not null

3. Checking if the variable is not null [Method 3]

Syntax:


variable != None

Example:


test = "hello python"

# if variable is not null
if test != None :
    print('yes! the var is not null')
    

output

yes! the var is not null



Conclusion

All methods work perfectly, but the method 1 is the best way to check if a variable is not null (None)