Alok Singhal, 10.04.2013 22:36: > The following code (also attached as a .pyx file) fails in the current > Cython : > > cdef class test: > pass > > def main(): > cdef test a, b, c, d > (a, b) = (c, d) = (None, None) > > When run, I get the following traceback: > > In [1]: import assign_test > In [2]: assign_test.main() > Traceback (most recent call last): > File "<ipython-input-2-c2f7599d7b34>", line 1, in <module> > assign_test.main() > File "assign_test.pyx", line 6, in assign_test.main (assign_test.c:669) > (a, b) = (c, d) = (None, None) > TypeError: Cannot convert NoneType to assign_test.test > > I am using the latest Cython development version (from github). Also > tested with Cython 0.18. > > $ git rev-parse HEAD > e8bd1789905a58d8224e4be5019be401f360aa54 > > I don't get an error when I change the assignments to either: > > (a, b) = (None, None) > > or > > a = b = None > > Is this a bug in Cython? I tried doing a git bisect and it seems like > commit ea6a71acb5c79afb080855be1cb6ca30d283ec25 is when the above code > started failing (It works with the previous commit).
Thanks for the report and the excellent analysis. Here is a fix: https://github.com/cython/cython/commit/eb1e7173133a5dcc266203e8928c60b2e3b8446a Plus, the generated code was horribly redundant. I cleaned it up. https://github.com/cython/cython/commit/2592064271ea1c1b9ad1844232c5890e06861eb3 Stefan _______________________________________________ cython-devel mailing list cython-devel@python.org http://mail.python.org/mailman/listinfo/cython-devel
