Recursively Search for Files with a Specific Extension

import os

target = 'c:\\Python38-64'

report = open('specific-ext.txt', 'w')

for root, dirname, files in os.walk(target):
    for x in files:
        if x.endswith('.txt'):
            report.write(root + '\\' + x + '\n')

report.close()

This code walks through the directory tree rooted at c:\\Python38-64, and for each file found with a .txt extension, it writes the full path of the file (composed of the root directory and the filename) to a file named specific-ext.txt.

First, it opens a new file named specific-ext.txt in write mode using the open() function. Then it loops through each directory, subdirectory, and file within the root directory using the os.walk() function. For each file found, it checks if its extension is .txt using the endswith() method of strings. If the extension is .txt, it writes the full path of the file to the specific-ext.txt file using the write() method of the file object. Finally, it closes the file using the close() method.