How to merge content from files with same name but in different folders by Python?

Question

I'm trying to merge content from different TXT files by using Python, but the challenge is I need to only merge content from the same file names coming from different folders. Here's a screenshot for your reference:

So far, I can print out all the file names with their full paths:

import os

for root, dirs, files in os.walk(".", topdown=False):
    for file in files:
        if file.endswith(".txt"):
            filepath = os.path.join(root, file)
            print (filepath)

However, how could I use Python to only merge files with the same name...still researching. Let me know if you know the answer, or point me a way to research more. Thank you very much and happy holidays!

Answer 1

import os

# create a dictionary with file names as keys
# and for each file name the paths where they
# were found
file_paths = {}
for root, dirs, files in os.walk('.'):
    for f in files:
        if f.endswith('.txt'):
            if f not in file_paths:
                file_paths[f] = []
            file_paths[f].append(root)

# for each file in the dictionary, concatenate
# the content of the files in each directory
# and write the merged content into a file
# with the same name at the top directory
for f, paths in file_paths.items():
    txt = []
    for p in paths:
        with open(os.path.join(p, f)) as f2:
            txt.append(f2.read())
    with open(f, 'w') as f3:
        f3.write(''.join(txt))

Answer 2

You should do something like below, note: code not tested.

import os

mapped_files = {}

for path, subdirs, files in os.walk("."):
    for file in files:
        if file.endswith(".txt"):
            if file in mapped_files:
                existing = mapped_files[file]
                mapped_files[file] = existing.append(path)
            else:
                mapped_files[file] = [path]

for key in mapped_files:
    files = mapped_files[key]
    first_f = os.path.join(path, files[0])
    with open(first_f, "a+") as current_file: 
        for path in files[1:]: # start at the second index
            f = os.path.join(path, key)
            content = open(f,"r").read()
            current_file.write(content) # add all content to the first file