>  os.access("/home/klas/epa.txt", F_OK)

>  but i get the following error:
>  
>  Traceback (most recent call last):
>    File "<pyshell#156>", line 1, in ?
>      kalle = os.access("/home/klas/epa.txt",F_OK)
>  NameError: name 'R_OK' is not defined

That's because F_OK is defined in the os module, 
so you need to use os.F_OK

But why not use the much sipler os.path.exists() 
function instead?

Alan G.

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