[Tutor] write problem

[Paul Sidorsky]

Danny Yoo wrote:

> The file position is at the end of the file, so you won't be able to read
> what you've immediately written until you rewind the file.  What you'll
> probably want to do is rewind or "seek()" back to the beginning of the
> file:
> 
> ###
> data.seek(0)
> ###

Furthermore, a seek should always be done before changing from reading
to writing (or vice-versa) in any case.   Some implementations of C
(which Python is written in) will do unpredictable things if this isn't
done.  I'm not sure if Python insulates against this or not but it's
probably a good idea not to take the chance.

-- 
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Paul Sidorsky                                          Calgary, Canada
paulsid@shaw.ca                        http://members.shaw.ca/paulsid/