Скачать или смотреть How to Convert Shell Find Logic to Python Script for Filtering File Names

Learn how to filter and extract specific file names in Python, using an example that converts shell commands to Python syntax.
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How to Convert Shell Find Logic to Python Script for Filtering File Names

When working with a directory full of files, especially in a development environment, finding and filtering specific file types can become a challenge. If you're familiar with shell scripting, commands like find and sed can efficiently handle these tasks. However, if you're looking to transition to Python, you may be wondering how to replicate this functionality in a more Pythonic way.

The Problem

In a given directory called vs, there are multiple files with the .vrlp extension, some of which include undesired patterns in their names, such as .ce.template.a. The goal is to filter these filenames so that only those without any additional patterns, specifically those ending in .vrlp, are displayed. For instance, you might want the output to look like this:

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

In contrast, filenames containing .ce.template.a or other specifications should be excluded from the list.

Breaking Down the Shell Logic

The original shell script that accomplishes this functionality uses sed commands to manipulate strings and filter filenames. Here's a breakdown of the critical lines in the bash script:

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

TEST_CASE: This variable extracts the core name of the file without the .vrlp extension and removes folder prefixes.

CLASS: This variable captures the class name by further manipulating FILENAME to strip away patterns and extensions.

Converting to Python

To accomplish the same task in Python, we can use the os module to navigate the directory structure and filter filenames directly. Below is a clean, straightforward Python script that aligns with the desired output:

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

Explanation of the Python Code

os.walk: This method allows you to iterate over all files in the given directory recursively.

os.path.basename: This function retrieves just the filename from the full path, without the preceding directories.

os.path.splitext: This utility splits the filename into its name and extension, which allows us to check if the base name includes additional dots.

Condition: The code includes a conditional statement to ensure that only files without embedded separators (.) are printed.

Example Output

When executed in a directory with files like:

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

The script produces the output:

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

Conclusion

By using Python, you can simplify the process of filtering filenames from a directory while enhancing your ability to read and understand the logic behind the operations. Transitioning from shell scripting to Python for file management tasks empowers greater scalability without sacrificing functionality. So whether you're converting an existing script or starting fresh, Python offers powerful tools to get the job done efficiently.

If you have further questions or need additional examples, feel free to ask in the comments below!