Скачать или смотреть How to Check if Input is an Int or Float in Range Using Python

Learn how to create a while loop in Python that validates user input to ensure it is an `integer` or `float` within a certain range.
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This video is based on the question https://stackoverflow.com/q/69417864/ asked by the user 'Digitalvolt' ( https://stackoverflow.com/u/17058806/ ) and on the answer https://stackoverflow.com/a/69417912/ provided by the user '2e0byo' ( https://stackoverflow.com/u/15452601/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Input Validation in Python: Checking for Int or Float in a Range

When programming, one common task is to validate user input. This can become tricky, especially when we want to ensure that the input is either an integer or a float and lies within a specific range. In this guide, we’ll break down how to create a while loop in Python that checks this condition effectively.

Understanding the Problem

Imagine you want to gather feedback on how someone felt on a particular day — let’s say Monday, on a scale from 1 to 10. The user must enter a number, and we need to make sure this number is either an integer or a float and falls within the specified range. The issue is that even if the user inputs a valid value, the program might not recognize it as such, and continues to prompt for input. Let's look at how to tackle this problem.

The Original Code

Here’s a look at the original code snippet provided:

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

What's Wrong with It?

Type Issue: The main problem here is that the input taken from input() always returns a string. Therefore, checking if Monday is an instance of int or float will fail.

Conversion Check: Since it’s a string, you’ll need to convert the input into a numeric type before performing any operations.

The Solution: Rewriting the Code

To effectively check if the input is a number and also within the desired range, the code needs to be altered. Here's a revised version:

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

Breaking Down the New Code

Infinite Loop: We use while True: to create an endless loop which we can break manually when valid input is received.

Input Conversion:

The try block attempts to convert the input string to a float.

If that conversion fails (due to invalid input), the program will trigger the except block, informing the user to provide valid input.

Range Checking: After conversion, we check if the number lies between 1 and 10. If it doesn’t, the program will notify the user accordingly.

Successful Input: If the input is valid and within range, a confirmation message is displayed, and the loop breaks.

Conclusion

Input validation is crucial in programming to prevent errors and ensure an excellent user experience. By learning how to effectively check if an input is an integer or float within a specified range, you can add more functionality and reliability to your applications.

If you have any questions or need further clarification on input validation in Python, feel free to leave a comment below!