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Скачать или смотреть Validating User Input in Python: Returning a Verified Variable from a Function

  • vlogize
  • 2025-04-10
  • 1
Validating User Input in Python: Returning a Verified Variable from a Function
Python- Return a verified variable from a function to the main programfunctionvalidationinputwhile loopinteger
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Описание к видео Validating User Input in Python: Returning a Verified Variable from a Function

Learn how to validate user input in Python by sending variables to functions and returning verified results. A practical guide for beginners!
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This video is based on the question https://stackoverflow.com/q/75477580/ asked by the user 'Steve' ( https://stackoverflow.com/u/10084343/ ) and on the answer https://stackoverflow.com/a/75478624/ provided by the user 'rhurwitz' ( https://stackoverflow.com/u/8635547/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Python- Return a verified variable from a function to the main program

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Validating User Input in Python: Returning a Verified Variable from a Function

When programming in Python, one common challenge is validating user input. This is especially crucial in scenarios where validated data is required for calculations or further logic. In this guide, we will explore a clear method to accept user input, validate it, and then return a verified variable from a function. Let’s dive in!

The Challenge

As a new Python programmer, you might have encountered situations where you're unsure if the user has provided valid input. For instance, let's say you're creating a program that requires the user to input the number of bolts for a building frame. You want to make sure that the user inputs a positive integer. If they do not, your program should prompt them to enter the value again until they provide valid input. Sound familiar?

The Solution: Using Functions for Validation

To tackle this problem, we can utilize a function that will check the value input by the user and ensure it meets our criteria. Here’s how you can implement this solution in Python:

Step-by-Step Breakdown

Define a Validation Function:
We will create a function called str_to_posint that takes a string input, attempts to convert it to an integer, and checks if it’s positive. If the conversion fails or the number is not positive, it will return None.

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

Prompt the User for Input:
We will use a while loop to repeatedly ask the user for input until a valid number of bolts is provided. Inside the loop, we will call our validation function.

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

Display the Verified Result:
Once a valid number has been entered, we can confirm to the user what they have input.

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

Complete Code Example

Here’s the complete code that combines all the pieces together:

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

Output Example

When you run the program, the output will resemble the following interaction:

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

Conclusion

By implementing this method, you can easily validate user input in Python, ensuring that your code behaves as expected. Functions streamline your process for checking and re-checking inputs. Don't hesitate to experiment further with this concept, as it lays the foundation for obtaining reliable data within your applications. Happy coding!

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