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Learn how to merge two JSON files in Python by combining their dictionaries, ensuring that values are added together correctly.
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How to Combine Two Dictionaries Additively in Python

Combining data from multiple sources is a common task in programming, especially when managing datasets or files in JSON format. One common scenario is merging two dictionaries additively based on their values. In this guide, we will explore how you can achieve this in Python, using JSON files as an example.

The Problem

Imagine you have two JSON files, each containing a dictionary of chemical data, and you want to merge these files into one. Here’s an example of the content of your two files:

file1.json:

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file2.json:

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Your goal is to merge these files so you have the following combined result:

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However, when you tried to merge the dictionaries, you ended up getting items in a list format that did not reflect the combined result you wanted.

The Solution

Here's how you can combine two dictionaries together in a way that retains their structure, as well as the associated values.

Step 1: Load the JSON Files

First, you need to load the contents of your JSON files into Python dictionaries. You can do that with the following code:

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

Step 2: Merge the Dictionaries

Next, you want to merge the dictionaries. You'll check if the key exists, and if it does, you’ll add the new entries. Here’s a concise way to do this:

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Example Output

After merging, your dict1 will look like this:

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Full Code Example

Here’s the complete code combining all steps:

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Conclusion

By following these steps, you can easily combine two dictionaries in Python while keeping all the information intact. This method allows you to add more files as needed without losing the relational structure of your data. Practice this technique, and it will significantly streamline your data management tasks!

By understanding how to manipulate JSON in Python, you can leverage powerful data processing capabilities that are essential for effective programming. Happy coding!