Скачать или смотреть Finding Duplicates in a 2D List Using Python 3

Discover how to effectively identify repeated elements in a `2D list` in Python 3. Learn the step-by-step solution to your coding challenge and enhance your programming skills!
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This video is based on the question https://stackoverflow.com/q/63007734/ asked by the user 'Anthony Lizarraga' ( https://stackoverflow.com/u/13967330/ ) and on the answer https://stackoverflow.com/a/63007947/ provided by the user 'Joe Ferndz' ( https://stackoverflow.com/u/13873980/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Find Duplicates in a 2D List - Python 3

When working with 2D lists in Python, you might encounter scenarios where you need to find repeated elements. One common application of this functionality is in creating games like Hangman, where identifying letters that appear more than once is crucial for gameplay. In this post, we will explore how to find duplicate letters within a 2D list, extracting their indices for further use.

The Problem: Duplicates in a 2D List

Let's start by looking at the sample 2D list provided in the question:

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

In this representation:

The first element of each sub-list is a character (the letter from the Hangman game).

The second element indicates whether the letter has been found.

The third element represents an x-coordinate.

The challenge is to determine which letters appear more than once in this list and to find their indices for further processing.

The Solution: Finding Duplicates

To tackle this problem, we can use a straightforward approach. Below are the steps we'll follow in our code:

Step 1: Extract Letters

First, we need to extract the letters from the 2D list into a separate list for easier manipulation:

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

The x list now contains all the letters:

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

Step 2: Find Duplicates

Next, we'll loop through our letter list to check for duplicates:

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

This code checks if the current letter exists in the preceding part of the list (x[:i]) or in the subsequent part (x[i+ 1:]). If either is true, it prints the letter alongside its index.

Output

When we execute the complete code below, we will see output identifying the duplicates and their indices:

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

Expected Output

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

Conclusion

Now you have a clear method to find duplicates in a 2D list using Python 3! This process not only enhances your coding skills but also prepares you for developing interactive applications like games. By identifying letters and their indices, you can create a more engaging gaming experience in Hangman.

Feel free to experiment with this approach and adapt it to other use cases in your programming projects!