[Numpy-discussion] major bug in fromstring, ascii mode
Charles R Harris
charlesr.harris@gmail....
Mon Jan 28 17:56:52 CST 2008
On Jan 28, 2008 4:09 PM, Eric Firing <efiring@hawaii.edu> wrote:
> Charles R Harris wrote:
>
> > Reading the code in arraytypes.inc.src and multiarraymodule.c, it
> > appears that numpy is using strtol(str, &tailptr, 0) for the string
> to
> > integer conversion. Calling strtol with BASE == 0 enables the
> automatic
> > base detection from the prefix.
> >
> > However, as you say, scanf does not do this. Numpy appears to use
> fscanf
> > when reading data from files, so there is a discrepancy here:
> >
> > >>> from numpy import fromfile, fromstring
> > >>> f = open('test.dat', 'w')
> > >>> f.write("20:09:21")
> > >>> f.close()
> >
> > >>> fromfile('test.dat', dtype=int, sep=':')
> > array([20, 9, 21])
> > >>> fromstring('20:09:21', dtype=int, sep=':')
> > array([20, 0])
> >
> >
> > I vote for fromstring working like fromfile.
>
> I agree. Can we get this change into 1.05? I could make a patch if
> that would help. Although I was wrong in calling this a "major bug", I
> think it is an inconsistency that should be removed. The fromfile and
> fromstring docstrings could also state explicitly what the behavior is.
Your best bet is to file a ticket. I you don't, I will, but I'll wait a bit.
Chuck
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