如何通过python检查文件是否被占用

#-*- coding: utf-8 -*-
from ctypes import windll
import time
import win32file
from win32file import *
 
def is_open(filename):
 
  try:
    #首先获得句柄
    vHandle =win32file.CreateFile(filename, GENERIC_READ, 0, None, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, None)
    #判断句柄是否等于INVALID_HANDLE_VALUE
    if int(vHandle)==INVALID_HANDLE_VALUE:
      print("# file is already open")
      return True # file is already open
    win32file.CloseHandle(vHandle)
 
  except Exception as e:
    print(e)
    return True