How to Access a List Inside a Dictionary in Python

Описание: Learn how to efficiently access elements in a list stored within a dictionary in Python with this simple guide.
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This video is based on the question https://stackoverflow.com/q/64711555/ asked by the user 'Aryaman Pandey' ( https://stackoverflow.com/u/11887648/ ) and on the answer https://stackoverflow.com/a/64711632/ provided by the user 'balderman' ( https://stackoverflow.com/u/415016/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Accessing a List Inside a Dictionary in Python

Python dictionaries are powerful data structures that allow you to store and manage data efficiently. One of their common uses is to contain lists as values. If you're working with an API or handling data that comes in dictionary form, you might find yourself needing to access a list inside a dictionary. In this guide, we'll walk you through the steps to do just that.

The Problem: Accessing Names from a List in a Dictionary

Suppose you have a dictionary that represents a response from an API. The structure looks like this:

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In this dictionary, the key 'people' holds a list of dictionaries, each containing the name of an astronaut and the spacecraft they are associated with. If you want to access just the names of these astronauts, how would you do it?

The Solution: Iterating Over the List

To extract names from the list under the 'people' key, you can iterate through the list and access the 'name' key in each dictionary. Here’s a step-by-step breakdown:

Step 1: Access the List

First, you need to reference the list inside the dictionary using the key 'people':

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Step 2: Loop Through Each Dictionary in the List

Next, you'll want to use a loop to go through each item (which is a dictionary) in the list. You can do this using a for loop:

Step 3: Retrieve the 'Name' Key

Within the loop, access the 'name' key from each dictionary:

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Complete Code Example

Here's the complete code that combines all the steps:

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Expected Output

When you run the above code, you will see the following output:

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Conclusion

Accessing a list inside a dictionary in Python is straightforward. By iterating over the list and referencing the keys properly, you can easily extract the information you need. This technique can be particularly useful when dealing with data fetched from APIs or complex data structures.

If you have any questions or need further assistance, feel free to reach out!