[PYTHON] Easy way to rename files

import os
import glob

N = 8 #Delete 8 characters to delete YYYYMMDD from the file name
EXT = "*.txt"
DIR = r"C:\Users\dirname" #The file path prefix "r" may not be needed.

os.chdir(DIR)
for file in glob.glob(EXT):
    os.rename(file,file[N:])

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