Скачать или смотреть Understanding the Custom Sorting Algorithm with Python

This guide explains how a custom sorting algorithm works in Python, breaking down the code that rearranges a string based on a specified pattern.
---
This video is based on the question https://stackoverflow.com/q/68488555/ asked by the user 'Barry99' ( https://stackoverflow.com/u/16504377/ ) and on the answer https://stackoverflow.com/a/68488791/ provided by the user 'devReddit' ( https://stackoverflow.com/u/16375479/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: I need some help , can anybody explain the Custom sorting code below ; how exactly the code blocks are working?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the Custom Sorting Algorithm in Python

Sorting strings can often be a straightforward task, but what if you need to sort a string based on a specific pattern? In this guide, we will explore a custom sorting algorithm written in Python. We will break down the provided code step by step to ensure that you understand how it operates, particularly focusing on how strings are rearranged based on character priority defined by a pattern.

The Problem: Custom Sorting with a Pattern

Imagine you have a string, eksge, and a pattern asbcklfdmegnot that you want to use to determine the order of characters in the string. The goal is to sort the characters in eksge according to their positions in the pattern, ultimately rearranging it to form a meaningful word — in this case, geeks. But how does this custom sorting work? Let’s dive into the code.

The Code Breakdown

Here is the provided Python code for custom sorting:

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

Step 1: Define the Pattern and Convert to a List

The function sortbyPattern takes in two parameters: pat, the pattern string, and str, the string to be sorted. The first line converts the pattern into a list of characters, allowing easier access and processing.

Step 2: Create a Priority Dictionary

Next, we build a dictionary called myDict. This dictionary is crucial for determining the sorting priority of each character based on its position in the pattern:

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

As a result, the dictionary will look like this:

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

Step 3: Convert the String to a List

To prepare for sorting, we convert the input string str into a list of characters. This allows the individual characters to be manipulated easily during the sorting process:

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

At this stage, the list looks like this:

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

Step 4: Sort the String Based on the Dictionary

The next step is where the magic happens. We use the sort method with a custom sorting key defined by our priority dictionary:

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

This sorts the characters in ascending order based on their priority values obtained from myDict, resulting in:

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

Step 5: Reverse the Sorted List

Since we want the highest priority characters to appear first, we reverse the sorted list using:

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

Now, the list looks like this, which represents our desired order:

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

Step 6: Join the Characters Into a String

Lastly, we join the list of characters back into a string to obtain the final sorted result:

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

The output will be geeks, as expected.

Conclusion

The sortbyPattern function demonstrates how you can perform custom sorting based on a specific character pattern in Python. By creating a priority dictionary and sorting based on that, you're able to reorder the characters in a string effectively. Understanding this practice not only improves your coding skills but also enhances your problem-solving abilities in programming.

Feel free to experiment with different input strings and patterns to see how the algorithm adapitates to various scenarios. Happy coding!