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Learn how to easily replace values in a JSON file with Python. Follow this step-by-step guide for a seamless experience!
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This video is based on the question https://stackoverflow.com/q/69805317/ asked by the user 'Yash Verma' ( https://stackoverflow.com/u/16428970/ ) and on the answer https://stackoverflow.com/a/69805412/ provided by the user 'Pulkit Kumar Agarwal' ( https://stackoverflow.com/u/15581055/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Efficiently Replace Values in a JSON File using Python

Working with JSON files in Python can often be a breeze, but sometimes you might hit a hiccup, especially when trying to replace values in the data. In this guide, we will tackle the problem of modifying values in a JSON structure through a practical coding example.

The Problem: Replacing Values in a JSON File

Let’s say you have a JSON file called gw.json that contains a list of objects, each representing a prize with attributes like gw_id, gw_prize, and gw_status. When an event or condition occurs (for instance, a prize is completed), you want to update the gw_status from "ongoing" to "completed".

Here is a glimpse of what the JSON structure looks like:

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Your initial approach might yield code that doesn’t work as intended. Don’t worry; we’ll sort it out and demonstrate the precise way to achieve this.

The Solution: How to Change Value in a JSON File

Step 1: Load the JSON Data

First, you need to open and read the JSON file to access the data. Here’s how you can do it:

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Step 2: Append New Data

Next, you may want to add new entries to your JSON array. You can create a new object and append it:

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Step 3: Modify the Status When Completion Occurs

The critical part is to change the gw_status value. Here’s how to do it effectively:

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

Comparison of gw.json Before and After

Before Running the Code

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After Running the Code

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Conclusion

By following this well-defined approach, you can successfully replace values in a JSON file using Python. It’s crucial to take care while manipulating your data structures, especially when appending or modifying entries.

Feel free to play around with the code and see how modifications impact your JSON file. Happy coding!