How to Create a Nested Dictionary from Two Dictionaries in Python

A guide for beginners on how to create a nested dictionary in Python where the first dictionary's values serve as keys in the corresponding second dictionary.
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How to Create a Nested Dictionary from Two Dictionaries in Python

Are you a Python newbie looking to tackle the problem of creating a nested dictionary? If you have two dictionaries and want to form a nested structure where the values of the first dictionary act as keys for the second, you're in the right place! This guide will guide you step-by-step through the process.

The Problem

Let's take an example to illustrate the issue at hand. Suppose you have the following two dictionaries:

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

In this scenario, you need to create a nested dictionary where each key corresponds to the data in First_dict, and its value is a sub-dictionary containing the respective distances from Second_dict.

The desired output structure would look like this for key 1:

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

The Solution

Now that we understand the problem, let's dive into the solution. We'll create a new dictionary, Third_dict, where we will assign key-value pairs based on the keys from First_dict and the corresponding lists from Second_dict. Here’s how you can do it efficiently:

Step-by-step Implementation

Initialize the Dictionaries: Begin by defining First_dict and Second_dict as shown above.

Create the Nested Structure: Use a loop to iterate over the keys of First_dict. For each key, pair the values in First_dict with the respective values in Second_dict using a dictionary comprehension.

Here's the complete code for this process:

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

Explanation of the Code

We start by initializing both dictionaries.

Then, we create a new empty dictionary Third_dict.

Using a for loop, we iterate through each key in First_dict.

The zip() function allows us to combine the values of First_dict and Second_dict into tuples, which we then convert into a dictionary comprehension. This results in every point from First_dict being paired with its corresponding distance from Second_dict.

Output

When you run the script, the output will be:

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

Conclusion

Creating a nested dictionary in Python can be straightforward once you break it down into manageable steps. By following this guide, you can efficiently pair values from two dictionaries based on their keys and create a structured format that meets your needs. Whether you are building a distance dictionary or tackling other complex data structures, mastering this approach will serve you well in your Python journey.

Now, go ahead and try it out for your own data! If you face any difficulties or have further questions, feel free to ask. Happy coding!