How to Use a Function's Return Value Immediately in Python

Learn how to effectively return values from functions in Python and how to use them in other methods within a class, even if you're just starting out!
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This video is based on the question https://stackoverflow.com/q/66439545/ asked by the user 'BintheDeveloper' ( https://stackoverflow.com/u/15314641/ ) and on the answer https://stackoverflow.com/a/66439570/ provided by the user 'Krishna Chaurasia' ( https://stackoverflow.com/u/5147259/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Use a Function's Return Value Immediately in Python

As a beginner coder, you might find yourself grappling with the intricacies of functions and data handling in Python. One common issue that arises is understanding how to use a function's return value right away. In this post, we will explore a specific scenario involving a class method and illustrate how to properly retrieve and utilize function results.

The Problem

You have written a simple Figure class that calculates the area based on its height and width. However, you are facing difficulties with using the result of the calcArea() method within another method called Tellarea(). Your issue arises because you try to call the function incorrectly, leading to confusion over where the function's return value has gone.

Understanding the Code

Here is the original code you wrote for the Figure class:

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

The __init__ method initializes your object with dots, height, and width.

The calcArea method calculates the area but only prints it rather than returning it.

The Tellarea method attempts to call calcArea but does not reference it correctly, leading to a NameError.

The Solution: Properly Using Return Values

Step 1: Modify the calcArea() Method

To make the calcArea() method return the area instead of just printing it, you need to use the return statement. Here’s how you can do it:

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

Step 2: Call the Method Correctly

In the Tellarea() method, instead of trying to pass self to calcArea(), simply call it using self like this:

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

Complete Example

Here’s how your complete code will look after these changes:

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

Conclusion

Understanding how to use a function's return value is fundamental in programming, especially in Python. By utilizing a return statement and correctly calling class methods, you can effectively handle data and create meaningful outputs.

Remember, coding can be challenging, but as you continue practicing, concepts like these will become clearer. Don't hesitate to ask "cute questions" – they lead to essential learning moments! Happy coding!

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