Sorting and Merging text-files [SOLVED]

[AlphaInc]

Hello everybody,

With a batch-script I export mutliple text-files to a specific folder where I want to merge them into one.
Therefore I used the type-command in windows cmd which worked fine. But after comparing the files I noticed that the order is wrong. I found out the CMD sorts them differently (file_1,file_10,file_11,file_2,file_3,file_33) instead of how I'm doing it (file_1,file_2,file_3,file_10,file_11,file_33).

Now I would like to use a Python Script do merge them together in the way I would sort them (file_1,file_2,file_3,file_10,file_11,file_33).

This is what I have so far but I don't know how to go on:

#!/usr/bin/env python3

import os
import re

folder_path = "../Outputs/"

for root, dirs, files in os.walk(folder_path, topdown = False):
    for name in files:
        if name.endswith(".txt"):
            file_name = os.path.join(root, name)

Edit: All my files start with string "file_" and an ongoing number. It differs how many files there will be after I exported them so I can't set it up manually.