------------- Original message ----------------------
From: Paul McNett <[EMAIL PROTECTED]>
> Paul McNett wrote:
>
> > Ed Leafe wrote:
> >
> >> On Jan 15, 2008, at 3:39 PM, Jeff Johnson wrote:
> >>
> >>> Thank Ed. But it IS a file object so I can pass it to:
> >>>
> >>> cp = ConfigParser.ConfigParser()
> >>> cp.readfp(f)
> >>>
> >>> Right? It appears to work fine.
> >>
> >> If you open it for write, it should be a zero-byte file. You would
> >> normally open the file for read (i.e., no parameter) before passing
> >> it to something that needs to read it.
> >
> > AFAIK (but test it for yourself at the command line), you either open
> > files read-only or write-only. IOW, if I open a file with 'w', I can
> > write to it but not read from it. I just tried that and got an exception
> > trying to read from it 'bad file descriptor'.
> >
> > If you want to open up a file to write to without first erasing its
> > contents, you use 'w+' mode.
>
> Oops, back to Python 101 for me:
>
> open("test", "r") -> read-only
> open("test", "w") -> write-only
> open("test", "w+") -> read/write
> open("test", "a") -> append-only
> open("test", "a+") -> append/read
>
> There are additional mode codes, such as 'b' which tells it not to
> automatically add newlines, which is usually what you want.
>
> Paul
>
Just to clarify , 'w+' truncates the file on open.
--
Adrian Klaver
[EMAIL PROTECTED]
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