On Mon, Nov 16, 2009 at 3:28 AM, Fernando Perez <fernando.pe...@berkeley.edu> wrote: > On Mon, Nov 16, 2009 at 2:31 AM, Fernando Perez > <fernando.pe...@berkeley.edu> wrote: >> The fact that Ctrl-C cleanly stops the crazy loop *without* a >> KeyboardInterrupt makes me think that ipython is trying to introspect >> the MS object and some C code is going into a mad loop (otherwise we'd >> see the Python signal handler showing a traceback). Do you have any >> other bugs related to this type of object that sound along those >> lines? > > Half-right. IPython is swallowing the kbd interrupt, but the bug is in > sage, it's the fact that len(MS) never returns: > > sage: MS = MatrixSpace(QQ,6,6,sparse=True); MS > Full MatrixSpace of 6 by 6 sparse matrices over Rational Field > sage: len(MS) > ^C--------------------------------------------------------------------------- > KeyboardInterrupt Traceback (most recent call last)
Thanks! Patch up at http://trac.sagemath.org/sage_trac/ticket/7449 for somebody to review. William > > /home/fperez/ipython/repo/kernel-config-lp/docs/<ipython console> in > <module>() > > /opt/sage/local/lib/python2.6/site-packages/sage/structure/parent.so > in sage.structure.parent.Parent.__len__ > (sage/structure/parent.c:5533)() > > /opt/sage/local/lib/python2.6/site-packages/sage/structure/parent.so > in sage.structure.parent.Parent.list (sage/structure/parent.c:4995)() > > /opt/sage/local/lib/python2.6/site-packages/sage/matrix/matrix_space.pyc > in __iter__(self) > 751 while True: > 752 for iv in > sage.combinat.integer_vector.IntegerVectors(weight, > number_of_entries): > --> 753 yield self(entries=[base_elements[i] for i > in iv], rows=True) > 754 > 755 weight += 1 > > /opt/sage/local/lib/python2.6/site-packages/sage/matrix/matrix_space.pyc > in __call__(self, entries, coerce, copy, rows) > 371 copy = False > 372 elif self.__is_sparse and isinstance(entries, (list, tuple)): > --> 373 entries = list_to_dict(entries, self.__nrows, > self.__ncols, rows=rows) > 374 coerce = True > 375 copy = False > > /opt/sage/local/lib/python2.6/site-packages/sage/matrix/matrix_space.pyc > in list_to_dict(entries, nrows, ncols, rows) > 1240 d[(row,col)] = x > 1241 else: > -> 1242 d[(col,row)] = x > 1243 return d > 1244 > > /opt/sage/local/lib/python2.6/site-packages/sage/interfaces/get_sigs.pyc > in my_sigint(x, n) > 7 > 8 def my_sigint(x, n): > ----> 9 raise KeyboardInterrupt > 10 > 11 def my_sigfpe(x, n): > > KeyboardInterrupt: > > > It seems that the ms object implements __len__, but this function > never returns. It's just that ipython was calling len() on it. > > Cheers, > > f > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
