How to Read JSON Key-Value Pairs in Python and Pass Them to a Function

Learn how to effectively read key-value pairs from a JSON file in Python and pass them to a function for further processing. Get insights and code examples to simplify your tasks in Python!
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Understanding JSON in Python: Reading Key-Value Pairs

JSON (JavaScript Object Notation) is a popular data format used for storing and exchanging data. It's lightweight and easy for humans to read, making it an excellent choice for configuration files in programming. In Python, JSON data can be easily manipulated using the built-in json library. In this guide, we will explore how to read key-value pairs from a JSON file and pass them as variables to a function.

The Problem at Hand

You have a JSON configuration file structured as follows:

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

Your goal is to read the name, var, and query values from each source and pass them to another Python function for further processing.

The Initial Attempt

You tried using the following code to read the JSON data, but it did not yield the expected results:

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

This code snippet is incorrect because it does not properly access the list of dictionaries under the sources key.

The Solution: Correctly Reading JSON Data

To achieve your goal, you can directly access the sources key from the parsed JSON data and iterate over the list of dictionaries to extract the values you need. Here’s how you can do it:

Step-by-Step Code Explanation

Import the JSON Library: You need to import the json library to work with JSON data.

Open and Load the JSON File: Open your JSON file and load its content.

Iterate Over Sources: Loop through each source in the sources list and extract the name, var, and query.

Call Your Function: Pass these values to your desired function.

Here’s the updated code that implements these steps:

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

Explanation of the Code

Opening the File: with open('file.json', "r") as myfile: This line opens your JSON file in read mode.

Loading JSON Data: json_data = json.load(myfile): This loads the JSON data into a Python dictionary.

Iterating through Sources: For each source in json_data['sources'], the code extracts the required fields.

Function Call: The pyfun function gets called with the extracted values.

Conclusion

By following this guide, you should be able to read key-value pairs from a JSON configuration file and pass them as variables to a function in your Python project. This will not only help you manage your configuration data efficiently but also streamline your coding workflow. Happy coding!

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