Changes the file extension of all files in the directory of this file. Don't know who else may need this but have it anyways.

FileExtensionChanger4000.py

import os
import time

extensionFrom = ".txt"
extensionTo = ".qc"

count = 0
for f in os.listdir():
    if f.endswith(extensionFrom):
        count += 1
        os.rename(f, f.replace(extensionFrom, extensionTo))
        print(f + " -> " + f.replace(extensionFrom, extensionTo))

if count == 0:
    print("No files found with extension " + extensionFrom)
else:
    print("\nRenamed " + str(count) + " file extensions.")

time.sleep(5)