Скачать или смотреть How to Convert JSON Dictionaries Back into Python Variables in Python 3

Learn how to efficiently load JSON dictionaries from a file back into Python variables using the `json` module in Python 3.
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This video is based on the question https://stackoverflow.com/q/64537625/ asked by the user 'Thomas Nguyen' ( https://stackoverflow.com/u/14309438/ ) and on the answer https://stackoverflow.com/a/64538728/ provided by the user 'jignatius' ( https://stackoverflow.com/u/9967571/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering JSON to Python Dictionary Conversion

If you're working with Python and JSON files, you've likely faced the challenge of saving and retrieving dictionaries. In this guide, we'll look at how to seamlessly convert JSON dictionaries back into Python dictionaries after they have been saved in a file. Specifically, we will tackle a common scenario where multiple dictionaries are written to a JSON file, each separated by a new line. Let's break down the problem and then explore the solution.

The Problem

Imagine you have two dictionaries in your Python program:

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

You converted these dictionaries to a JSON file named example.txt like so:

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

Now, when you restart your Python program, you want to read these dictionaries back from the JSON file and assign them to their original variable names.

The Solution

Step 1: Read the JSON File

To retrieve the dictionaries, you will first need to read the file. Since each dictionary is on its own line, we can read all lines and split them accordingly. Here’s how to do it:

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

Explanation:

infile.read() reads the entire content of the file.

.splitlines() splits the content into a list of lines and removes any newline characters (this is key!).

Step 2: Convert JSON Strings Back to Dictionaries

Now that you have extracted the lines containing your JSON data, the next step is to parse each line back into a Python dictionary using the json.loads() function. Here’s how to do that:

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

Explanation:

json.loads() converts a JSON string (in this case, read from the file) back into a Python dictionary.

lines[0] corresponds to the first dictionary (stored in variable a), and lines[1] corresponds to the second dictionary (stored in variable b).

Full Code Example

Putting it all together, below is the complete code for both saving and loading:

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

Conclusion

In this blog, we discussed how to convert JSON dictionaries back into Python variables after saving them to a file. By using the json module, you can easily read lines from a file and parse them into dictionaries, preserving the structure of your data. This simple yet powerful technique can help streamline your data handling in Python projects, making your code cleaner and more efficient.

Now, you're equipped to handle and manipulate JSON data in your Python applications with ease! Happy coding!