[ANN] isrealfile function

[Peter Hansen]

Manlio Perillo wrote:

> def isrealfile(file):
>     """
>     Test if file is on the os filesystem
>     """
>     
>     if not hasattr(file, 'fileno'): return False
> 
>     try: tmp = os.dup(file.fileno())
>     except: return False
>     else: os.close(tmp); return True
> 
> I have implemented this function for testing if a Python script is
> being executed by Python.exe or Pythonw.exe. In the latter case, in
> fact, Microsoft implementation of stdout/stderr is broken.

I haven't tested this idea, but wouldn't "os.isatty()" be
the right thing for this purpose, instead of the os.dup()
and os.close() stuff?

-Peter