Скачать или смотреть How to Get a List of Non-Repeating Substrings from a String

Learn how to extract all non-repeating substrings from a given string with ease. This guide will break down the solution in a simple and organized way.
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This video is based on the question https://stackoverflow.com/q/68458626/ asked by the user 'Sidhant Pradhan' ( https://stackoverflow.com/u/14726014/ ) and on the answer https://stackoverflow.com/a/68466149/ provided by the user 'starboy_jb' ( https://stackoverflow.com/u/7998639/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Get a List of Non-Repeating Substrings from a String

When working with strings in programming, you may encounter scenarios that require you to extract unique sequences of characters called substrings. A common problem developers face is how to get a complete list of non-repeating substrings from a given string. In this post, we will explore how to achieve this using Python, and we'll address a common issue with a simple solution.

The Problem at Hand

Suppose we have a string, for example:

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

When we run our initial code, we intend to extract non-repeating substrings, but we notice that the output is not what we expect. Here’s the original code snippet that doesn't yield the right results:

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

Output Issue

Running the above code produces the following output:

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As you can see, we only get two substrings instead of the expected three. The desired output should look like this:

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

The Solution

To achieve the desired result, we must slightly modify our approach. We need to ensure that after the iteration through the string is complete, we check if the last collected list of characters (l) is non-empty and needs to be appended to the results list (li).

Revised Code

Here’s the updated code that addresses the issue:

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Explanation of Changes

Final Check: By adding a check after the loop with if len(l) > 0:, we ensure that if there are any characters left in l, they're appended to li. This handles the situation where the last substring isn't added to the list.

Simplicity: The overall structure remains simple and effective. The list comprehension and appending logic allow for clear organization of the program.

Conclusion

By making a small adjustment to our original code, we’ve resolved the issue of missing the last non-repeating substring. Now, when we run the revised code, we achieve the expected outcome of:

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

This solution highlights the importance of considering edge cases, especially when processing collections in programming. Keep these tips in mind for your future string manipulation tasks!

Feel free to implement the code in your projects, and happy coding!