Using Python to Check If Variable is Not None

To check if a variable is not None, you can use the inequality operator != and check if the variable is not equal to None.

a = None
b = "Not None"

if a != None:
    print("a is not None")

if b != None:
    print("b is not None")

#Output:
b is not None

You can also use the is keyword combined with the not keyword to check if a variable is not None.

a = None
b = "Not None"

if a is not None:
    print("a is not None")

if b is not None:
    print("b is not None")

#Output:
b is not None

When working with variables in Python, the ability to check if a variable is a specific type easily is valuable.

One such case is if you want to check if a variable is not None.

The None keyword is used to define a null value. You can use None to set a variable to null and another case where you might get None is if you have a function which doesn’t return a value.

You may want to check if a variable is not None in the case that you have code which depends on a variable having a valid value.

To check if a variable is equal to not None, you can use the inequality operator != and check if the variable is not equal to None.

Below shows you an example of how you can check if a variable is not None in Python.

a = None
b = "Not None"

if a != None:
    print("a is not None")

if b != None:
    print("b is not None")

#Output:
b is not None

You can also use the is keyword combined with the not keyword to check if a variable is not None.

a = None
b = "Not None"

if a is not None:
    print("a is not None")

if b is not None:
    print("b is not None")

#Output:
b is not None

Hopefully this article has been useful for you to learn how to check if a variable is not None.