Скачать или смотреть Understanding Key-Value Pairs in Text Files with Python

Explore how to effectively work with key-value pairs in text files using Python. Learn to separate keys and values efficiently, enhance your code logic, and modify data seamlessly.
---
This video is based on the question https://stackoverflow.com/q/74843079/ asked by the user 'Kilmton Starvy' ( https://stackoverflow.com/u/20802638/ ) and on the answer https://stackoverflow.com/a/74843393/ provided by the user 'Jamiu S.' ( https://stackoverflow.com/u/19290081/ ) 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: How to get each key an value separate in text file using python

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.
---
Understanding Key-Value Pairs in Text Files with Python: A Step-by-Step Guide

When dealing with data in Python, especially from text files, the concept of key-value pairs is pivotal. In this guide, we will address two common problems faced by beginners when working with text files that contain these pairs. We'll walk through the solutions and provide clear examples to help you grasp the correct approach.

Problem 1: Stopping the Loop After Successful Login

The Scenario

You have a login system that reads user credentials from a file named login.txt. The content looks like this:

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

The current code loops through the lines continually, even after a successful login, which can be frustrating.

The Solution

To improve the code, you need to add a break statement right after a successful login. Here's how you can implement that:

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

Key Points:

Break Statement: This statement exits the loop after a successful match. Once logged in, the user won’t be prompted to log in again.

Code Flow: The program will print appropriate messages based on whether the username or password is incorrect.

Problem 2: Modifying a Value in Another Text File

The Scenario

In addition to the login functionality, you have another file, passenger.txt, containing passenger data like this:

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

You want to modify the Status of a specific passenger based on their civil ID.

The Solution

To change the Status field based on user input, you can assign a new value effectively. Here’s how:

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

Key Points:

Updating Status: By modifying the status variable directly, you can set it to "Arrival Approved" or any other relevant status based on user input.

Check Conditions: Ensure to tailor conditions based on real-world scenarios.

Conclusion

Understanding how to manipulate key-value pairs in text files using Python is crucial for effective data handling. This guide addressed common issues related to user login and data modification in text files, providing clear solutions to help you streamline your code. By implementing these strategies, you can enhance your programming skills and build more robust applications.

Feel free to reach out for any further queries or clarifications on this topic!