Because of multithreading semantics, this is not reliable.

[OlafMeding at gmail.com]

Christophe

> Same reason that there is a warning in the "os.access" manual

I understand the if file exists open it code.

I looked at the os.access documentation and see no "warning" or "not
reliable" wording there.
  6.1.4 Files and Directories
  access(path, mode)


Olaf