[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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