cPickle and HIGHEST_PROTOCOL problems

[Simon Dahlbacka]

"Tim Peters" <tim.one at comcast.net> wrote in message news:<mailman.35.1077634851.8594.python-list at python.org>...
> [Simon Dahlbacka]
> > I'm trying to cache some information using cPickle
> > and I thought that using cPickle.HIGHEST_PROTOCOL would give me an
> > efficient representation.
> >
> > However,
> >
> > when trying to load the information back I just keep getting a broken
> > pickle with EOF error from cPicle.load(file('myfile.pickle','r'))
>                                                               ^^^
> 
> Change that 'rb'.  Also make sure that the file you write the pickle to is
> opened with 'wb'.
> 
> > if I am not using cPickle.HIGHEST_PROTOCOL  or -1 or 2 it seems to
> > work nicely, is this a bug or something else?  (python 2.3.2 on winxp)
>                                                                   ^^^^^
> 
> Windows distinguishes between text-mode and binary-mode files.  Pickles are
> binary data, so files containing pickles must always be opened (for both
> writing and reading) in binary mode.  "Mysterious errors" are expected if
> you don't.

..of course! I should have thought of that.. but thanks anyway. 
obviously, that fixed the problem, I guess this one goes into the
category of "Stupid user errors" ;)