check_encoding.py

import os

def walk(r='.'):
  for cd,_,fns in os.walk(r):
    for fn in fns:
      yield os.path.join(cd,fn)

def check(fn,enc='utf8'):
  try:
    with open(fn,'r',encoding=enc) as f:
      c = f.read()
  except Exception:
    return fn

def convert(fn,enc0='gbk',enc1='utf8'):
  with open(fn,'r',encoding=enc0) as f:
    c = f.read()
  with open(fn,'w',encoding=enc1) as f:
    f.write(c)
  print(fn)
  
for fn in walk():
  if check(fn):
    convert(fn)