How to Create a Nested Dictionary from Two Dictionaries in Python

Learn how to transform two dictionaries into a nested dictionary in Python, enabling structured data retrieval and manipulation.
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Creating a Nested Dictionary from Two Dictionaries in Python

In the world of Python programming, managing data efficiently is crucial for success, especially when handling complex datasets. One common challenge developers often face is how to create a nested dictionary using the values of one dictionary as keys in another. In this guide, we will delve into a specific scenario where you might want to achieve this and provide a clear step-by-step guide to accomplish it.

The Problem

Imagine you have two dictionaries that were defined in your project as follows:

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

Your goal is to create a third dictionary (dict3) that nests the values of the first dictionary (dict1) and maps them to their corresponding values in the second dictionary (dict2). The expected output should look like this:

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

Key Steps to Solve the Problem

Now let’s break down the necessary steps to achieve this transformation from dict1 and dict2 to the nested dictionary dict3.

Step 1: Initialize the New Dictionary

First, you need to create an empty dictionary, which will hold your final nested dictionary:

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

Step 2: Loop Through First Dictionary

You will iterate over the key-value pairs in dict1 using a for loop. For each key, you will access its associated value (which is a list) and use that value as a key to reference dict2.

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

val1 is the key from dict1 (e.g., 'A' or 'C')

val2 is the list associated with that key (e.g., ['B'] or ['D'])

val2[0] extracts the first item from the list (the actual dictionary key, 'B' or 'D')

dict2[val2[0]] retrieves the corresponding value from dict2, which will be a list

Step 3: Evaluate the Result

After executing the loop, your new dictionary (new_dict) will mirror the structure of dict1, embedding references to dict2. To see the result printed out, simply write:

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

Complete Code Example

Here’s the full code that demonstrates the entire process:

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

Conclusion

Creating a nested dictionary in Python from two existing dictionaries can streamline data access and organization in your projects. With just a few lines of code, you can effectively link related data points. If you followed along with the instructions, you now have a robust nested structure that you can manipulate as needed!

Remember, code can be challenging at times, but breaking it down helps. Happy coding!