How to check whether a file is_open and the open_status in python

Question

Is there any python functions such as:

filename = \"a.txt\"
if is_open(filename) and open_status(filename)==\'w\':
   print filename,\" is open for writing\"         


        

Answer 1

Here is an is_open solution for windows using ctypes:

from ctypes import cdll

_sopen = cdll.msvcrt._sopen
_close = cdll.msvcrt._close
_SH_DENYRW = 0x10

def is_open(filename):
    if not os.access(filename, os.F_OK):
        return False # file doesn't exist
    h = _sopen(filename, 0, _SH_DENYRW, 0)
    if h == 3:
        _close(h)
        return False # file is not opened by anyone else
    return True # file is already open