Скачать или смотреть How to Traverse a JSON File and Find Key Name Using Value in Python

Learn how to effectively traverse a JSON file in Python to find key names associated with specific values. This guide provides a clear solution with code examples.
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This video is based on the question https://stackoverflow.com/q/71080213/ asked by the user 'Ankit Bijlwan' ( https://stackoverflow.com/u/14477834/ ) and on the answer https://stackoverflow.com/a/71080377/ provided by the user 'Bendik Knapstad' ( https://stackoverflow.com/u/6547224/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Finding Parent Key Names in a JSON File Using Child Value

When working with JSON data in Python, you often need to extract specific information based on certain values. A common scenario is needing to find a parent key name based on its corresponding child value. In this guide, we’ll explore a straightforward approach to solving this problem using Python.

The Problem

Imagine you have a JSON file structured like this:

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

You might want to retrieve the parent key name(s) when given a child name. For instance:

User Input: Child1

Expected Output: Parent1

User Input: Child5

Expected Output: Parent1, Parent2

Finding these parent names manually can be tedious, especially if the JSON data is large. That’s where our Python code comes into play.

Solution Overview

To achieve this, we will utilize the following key steps in our Python code:

Input Gathering: We'll prompt the user to enter the child name they are interested in.

Data Traversal: We will loop through the JSON structure to check each parent for the presence of the child name.

Storing Results: If a parent contains the child, we will store that parent’s key name in a results list.

Let's break down the solution step-by-step.

Step-by-Step Solution

Step 1: Sample JSON Data

For our implementation, we will define our JSON data in Python. In real scenarios, you may be reading this data from a file.

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

Step 2: Gathering User Input

We will prompt the user for the child name they want to search for.

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

Step 3: Traversing the JSON Structure

Next, we will set up a loop to check each parent key's children to see if the user-specified child name exists.

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

Step 4: Output the Results

Finally, we will print out the results stored in the ans list.

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

Complete Python Code

Putting all the steps together, our final code will look like this:

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

Conclusion

By following the steps outlined above, you can easily traverse a JSON file and retrieve parent key names based on child values in Python. This technique can be very useful in various data analysis and processing tasks.

Feel free to adjust the code to accommodate your data structures and needs. With just a few lines of code, you can efficiently navigate JSON data and extract valuable information!