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Discover why you see `None` after your output and learn how to fix it easily in Python functions!
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This video is based on the question https://stackoverflow.com/q/64691559/ asked by the user 'Rachel Cyr' ( https://stackoverflow.com/u/14503219/ ) and on the answer https://stackoverflow.com/a/64691581/ provided by the user 'rdas' ( https://stackoverflow.com/u/2947378/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Get Around None Printing When Using a Function in Python

Have you ever faced the perplexity of seeing None print out after running a function in Python? It can be frustrating, especially when you've worked hard to format your output just right. In this guide, we’ll address this common issue with clarity and provide you a straightforward solution to resolve it.

The Problem: None Appearing Unexpectedly

Let’s consider a scenario where you’ve written a function to generate multiplication tables. After taking all the effort to format it perfectly, you call the function and see None printed at the end of your output. Here's how the situation looks:

[[See Video to Reveal this Text or Code Snippet]]

Observing the Output

When you run the code, the output appears as follows:

[[See Video to Reveal this Text or Code Snippet]]

What Causes the None?

The None that appears at the end comes from the fact that you are using the print function to display the result from multitables(3). Since the multitables function does not return any value (it lacks a return statement), Python returns None by default. Consequently, that None gets printed out.

The Solution: Avoid Printing the Returned Value

To resolve this issue, the solution is strikingly simple. Instead of printing the call to your function, you should simply invoke the function without the print() statement. Here’s the modified code:

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Updated Output

Now, when you run the updated code, it will yield:

[[See Video to Reveal this Text or Code Snippet]]

The None is gone, leaving you with just the well-formatted multiplication table you intended to display.

Summary

In summary, if you encounter the issue of None appearing after your function's output in Python, remember these key points:

Understand Why: The None appears because the function doesn’t return a value, and you are printing its (non-existent) return value.

Implement the Fix: Call the function directly without using the print() function.

By following these steps, you can effectively avoid the confusion that arises from unexpected None outputs in Python, and focus on creating beautifully formatted outputs!

Thank you for reading! Happy coding!