i found out the problem. it was a poblem with my fileystem. the filesystem 
isn't able to craete unnamed tempfiles (tempfile.TemporaryFile()).
but this feature is used by the FieldStorage class in the cgi module.

i have solved the problem like that:

class MyFieldStorage(cgi.FieldStorage):
    def make_file(self, binary=None):
        return tempfile.NamedTemporaryFile()

then i have used the FieldStorage Class native and not throug web.py.
thanks anyway.

Am Samstag, 20. Oktober 2012 14:18:40 UTC+2 schrieb Jason Macgowan:
>
> Can you post more of the code?  It's hard to see what's going on from just 
> this 
>
> On Fri, Oct 19, 2012 at 10:26 AM, David <[email protected] <javascript:>> 
> wrote: 
> > whenever i try to get a file with web.input().myfile i get a IOError. 
> > 
> > IOErorr: [Errno 2] No such file or directory 
> > 
> > i could get the file with web.data() but this way i have the problem 
> that i 
> > can't read the file with the xlrd module cause of the header in 
> web.data() 
> > 
> > what could be the problem? is there maybe a way to cut the header form 
> > web.data() 
> > 
> > thanks for help 
> > david 
> > 
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