Does the following program access a file in a subfolder of a folder?

Question

using

import sys

folder = sys.argv[1]
for i in folder:
    for file in i:
        if file == "test.txt":
            print (file)

would this access a file in the folder of a subfolder? For Example 1 main folder, with 20 subfolders, and each subfolder has 35 files. I want to pass the folder in commandline and access the first subfolder and the second file in it

Answer 1

Here's a short example using the os.walk method.

import os
import sys


input_path = sys.argv[1]
filters = ["test.txt"]
print(f"Searching input path '{input_path}' for matches in {filters}...")


for root, dirs, files in os.walk(input_path):
    for file in files:
        if file in filters:
            print("Found a match!")
            match_path = os.path.join(root, file)
            print(f"The path is: {match_path}") 

If the above file was named file_finder.py, and you wanted to search the directory my_folder, you would call python file_finder.py my_folder from the command line. Note that if my_folder is not in the same directory as file_finder.py, then you have to provide the full path.