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If you're just combining text files together, the simplest method, especially if you're already using Python, is just to use a Python script that merges text files. This one will merge all .idf files in the directory (including subfolders) into a single file called merge.idf. Just copy the script into whatever directory in which you want to combine all the IDFs.

# This script copies all .idf files in dir and writes them into a new file called merge.idf
import os
dir = os.path.dirname(os.path.realpath(__file__))

mereged_text = ""

for path, subdirs, files in os.walk(dir):
    for name in files:
        ext = os.path.splitext(name)[-1].lower()
        if ext == ".idf":
            with open(name) as fp:
                text = fp.read()
            mereged_text += text
            mereged_text += "\n" # if new line is desired
with open ('merge.idf', 'w') as fp:
    fp.write(mereged_text)