Скачать или смотреть How to Fix Your Python Program to Continuously Accept User Input Until "Quit" Is Typed

Discover how to modify your Python program to accept user input more than twice without using loops. Learn about recursive function calls to achieve this!
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This video is based on the question https://stackoverflow.com/q/62462521/ asked by the user 'ktas' ( https://stackoverflow.com/u/10475698/ ) and on the answer https://stackoverflow.com/a/62462578/ provided by the user 'anbcodes' ( https://stackoverflow.com/u/9225514/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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The Problem: User Input Limited to Twice

Have you ever faced the frustration of trying to get user input in your Python program, only to find out that it's not accepting input more than a couple of times? If you've encountered an issue where your program stops accepting user input after just two tries, you're not alone! Many programmers face similar dilemmas, especially when they want to avoid using loops and instead opt for a more creative solution.

In this article, we'll look at an example from a user who wants to write a program that takes input from the user until they type the word "quit." The challenge is to create this functionality without using traditional loops like for or while. Let's break down the problem and explore a suitable solution using recursion.

Understanding the Original Code

Here's a brief look at the initial attempt at the program:

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

What Happens Here?

The program begins by asking the user for input.

If the input is not the word "quit," it counts the characters in the entered input.

However, at this point, the program only requests input once more before effectively stopping, which can be disappointing when you want an ongoing interaction until "quit" is entered.

The Solution: Using Recursion

To solve this problem, we can utilize recursion – a technique where a function calls itself to achieve repeated actions. By calling the function again whenever valid input is received, we can continue to ask the user for input until "quit" is typed.

The Revised Code

Here's how you can implement the solution using recursion:

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

Explanation of the Changes Made:

Recursion implementation: By returning num(summ) when input is not "quit," we effectively create a loop without using traditional looping constructs.

Parameter for summ: The continuation of the character count is done by passing summ as a parameter on each call. This ensures that the character total accumulates through each input provided by the user.

Default value: The default value for summ is set to 0, so if no value is passed on the first call, it starts from zero.

Important Note:

This design technique effectively mimics loops, allowing for continuous input without explicitly using loop statements. It demonstrates how recursion can serve as an alternative programming paradigm to iterate through user actions.

Conclusion

By employing recursion, you can create a program that accepts user input continuously until a specific condition is met (in this case, typing "quit"). This not only enhances your program's functionality but also allows you to practice a more advanced programming concept. So next time you're wondering how to get input multiple times without loops, give recursion a try!

Hopefully, this solution helps you enhance your Python skills and resolve your input limitation problem effectively! Happy coding!