Скачать или смотреть How to Sort Alphanumerical Values in Python Lists

Discover how to effectively sort alphanumerical lists in Python using regex and custom sort functions. Get clear examples and explanations.
---
This video is based on the question https://stackoverflow.com/q/63703283/ asked by the user 'jhon.smith' ( https://stackoverflow.com/u/1224977/ ) and on the answer https://stackoverflow.com/a/63703463/ provided by the user 'Alvis矜' ( https://stackoverflow.com/u/14207226/ ) 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: sort a list which contains alphnumerical values

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.
---
How to Sort Alphanumerical Values in Python Lists

Sorting a list that contains alphanumerical values can be a daunting task if you're not familiar with how to handle string manipulation in Python. If you're trying to achieve a clean order in your list, it's essential to understand the logic behind sorting both letters and numbers correctly. In this post, we will explore the problem of sorting such lists and offer a clear solution to achieve the desired output.

The Problem Statement

Let's say you have a list as follows:

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

You want to sort this list so the output appears like this:

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

The challenge lies in how to appropriately compare the alphanumerical values, as they contain both letters and numbers.

What Went Wrong?

Initially, you may have attempted to define a custom function to extract values for sorting:

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

However, using ASCII values and a basic string sorting approach didn't yield the correct order. The command sorted(my_list, key=my_func) provided an output that was not as desired.

The Solution

To correctly sort the list containing alphanumerical values, we can make use of the re module in Python, which provides regular expression matching operations. Here’s how you can implement a custom sorting function effectively.

Step-by-Step Breakdown

Import the Regular Expressions Module:
First, we'll import the re module, which allows us to handle regular expressions.

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

Define the Alphanumerical List:
Start by defining your list of alphanumerical values.

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

Compile a Regular Expression:
We need to compile a regex pattern that helps us in separating the digits from letters.

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

Create the Sorting Function:
Define a function that uses this regex to split each string into parts, allowing us to sort numerically as well as alphabetically.

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

Sort the List:
Finally, we will sort my_list using the custom function we just created.

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

Output the Result:
Now you can print the sorted list to confirm the ordering.

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

Final Output

When you execute the code, you should receive the correctly sorted list:

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

Conclusion

Sorting alphanumerical values can seem tricky, but by using tools like regular expressions and custom sorting methods, you can achieve the desired output. Implementing these steps in your Python code will not only enhance your skills but also efficiently solve the common issue of sorting mixed data types. Happy coding!