• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

The Programming Expert

Solving All of Your Programming Headaches

  • HTML
  • JavaScript
  • jQuery
  • PHP
  • Python
  • SAS
  • Ruby
  • About
You are here: Home / Python / How to Declare Variable Without Value in Python

How to Declare Variable Without Value in Python

February 8, 2022 Leave a Comment

In Python, sometimes it makes sense to declare a variable and not assign a value. To declare a variable without a value in Python, use the value “None”.

variable_without_value = None

You can also use what Python calls “type hints” to declare a variable without a value.

variable_without_value: str #variable with type string with no value

When working with variables in Python, sometimes it makes sense to initialize a variable, but not assign it any value.

While Python is dynamic and you don’t need to declare a variable until you’re going to assign a value to them or use them, it’s possible to define a variable without a value in a few ways.

The first way is to assign a variable to the value “None”.

variable_without_value = None

print(variable_without_value)

#Output:
None

In this case, make sure that when you set the variable to None that is what you want to do. In some cases, it might lead to an incorrect value when you go to use the variable later in your program.

The second way is to use what Python calls “type hints”. The problem here is that the variable isn’t defined, but does exist in your program.

variable_without_value: str #variable with type string with no value

print(variable_without_value)

#Output:
Traceback (most recent call last):
  File https://extendsclass.com/lib/Brython-3.8.9/www/src/Lib/site-packages/editor.py, line 116, in run
    exec(src, ns)
  File <string>, line 3, in <module>
NameError: name 'variable_without_value' is not defined

Hopefully this article has been useful for learning how to declare variables without values in Python.

Other Articles You'll Also Like:

  • 1.  Python acosh – Find Hyperbolic Arccosine of Number Using math.acosh()
  • 2.  Touch File Python – How to Touch a File Using Python
  • 3.  How to Sort Numbers in Python Without Sort Function
  • 4.  Using Python to Reverse Tuple
  • 5.  Using Lambda Expression with min() in Python
  • 6.  Using Python to Add String to List
  • 7.  Find Index of Maximum in List Using Python
  • 8.  How to Write Excel File to AWS S3 Bucket Using Python
  • 9.  Euclidean Algorithm and Extended Euclidean Algorithm in Python
  • 10.  Using Python to Calculate Average of List of Numbers

About The Programming Expert

The Programming Expert is a compilation of a programmer’s findings in the world of software development, website creation, and automation of processes.

Programming allows us to create amazing applications which make our work more efficient, repeatable and accurate.

At the end of the day, we want to be able to just push a button and let the code do it’s magic.

You can read more about us on our about page.

Reader Interactions

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

About The Programming Expert

the programming expert main image

Welcome to The Programming Expert. We are a group of US-based programming professionals who have helped companies build, maintain, and improve everything from simple websites to large-scale projects.

We built The Programming Expert to help you solve your programming problems with useful coding methods and functions in various programming languages.

Search

Learn Coding from Experts on Udemy

Looking to boost your skills and learn how to become a programming expert?

Check out the links below to view Udemy courses for learning to program in the following languages:

Copyright © 2023 · The Programming Expert · About · Privacy Policy