Rename foo_dr.txt to DRX.txt

foo_dr_renamer.py

# usage: python3 foo_dr_renamer.py /path/to/music/folder/
# change ASK_FOR_CONFIRMATION to True if you want to decide manually

import os, sys, shutil

ASK_FOR_CONFIRMATION = False

if len(sys.argv) < 2:
	print("no path given")
	sys.exit(1)
else:
	in_path = os.path.abspath(sys.argv[1])

# find foo_dr files
print("searching for foo_dr.txt's in", in_path, "...")
for path, dirs, files in os.walk(in_path):
	for f in files:
		if f == "foo_dr.txt":
			fullpath = os.path.join(path, f)

			# found foo_dr, read in lines
			with open(fullpath) as foodr:
				lines = foodr.readlines()
			# look for DR value in lines
			for l in lines:
				if "Official DR value:" in l:
					# found
					value = l.split(": ")[1].rstrip() # split at ": ", second component is DRX
					break


			new_filename = value + ".txt"
			new_filepath = os.path.join(path, new_filename)
			print(fullpath, "-->", new_filepath)

			if ASK_FOR_CONFIRMATION:
				decision = input("ok? y/N")
				if decision.lower() == "y":
					should_rename = True
					print("OK, Renaming")
				else:
					should_rename = False
			else:
				should_rename = True

			if should_rename:
				shutil.move(fullpath, new_filepath)
print("done")