On Sunday, January 10, 2016 at 9:26:53 AM UTC-8, Daniel Krenn wrote:
>
> On 2016-01-10 15:18, Vincent Delecroix wrote:
> > Would better to post to sage-support.
>
> F'up set
>
> > What about doing the test in the console? You can also change the
> > doctest to
> >
> > m2.__repr__()
> >
> > that would show the traceback.
>
> This shows that the problem is += in
> s += self.separator.join(E)
> with
> TypeError: unsupported operand type(s) for +=:
> 'NoneType' and NoneType'
>
> The weird thing is, that when I put an
> print E
> before that line, it magically works.
>
Does "print E" initialize some variables or do anything relevant?
John
>
> Daniel
>
> > On 10/01/16 08:16, Daniel Krenn wrote:
> >> I am trying to rewrite some code and have troubles with the following
> >> code:
> >>
> >> cdef str s = self.name
> >> if s:
> >> s += ' '
> >> s += self.opening_delimiter
> >> cdef list E = list('{!r}'.format(self.get(n))
> >> for n in xrange(min(num_elts,
> self.preview)))
> >> if num_elts >= self.preview:
> >> # PROBLEM/BUG with the following code line
> >> # (run doctests of this file to see)
> >> E.append(self.more) # <<<<<<<<<<<<<<< here
> >> s += self.separator.join(E)
> >> s += self.closing_delimiter
> >> return s
> >>
> >> With the marked line, many doctests fail; like this:
> >>
> >> Failed example:
> >> m2
> >> Expected:
> >> lazy list [8, 10, 12, ...]
> >> Got:
> >> <repr(<sage.data_structures.lazy_list.lazy_list_abstract at
> >> 0x7f684d746d40>) failed: TypeError: unsupported operand type(s) for +=:
> >> 'NoneType' and 'NoneType'>
> >>
> >> Any ideas what goes wrong? (I've debugged now for over one hour and
> have
> >> no glue (but I am no Cython expert)).
> >> I've also tried without the "cdef str" and "cdef list" above. The
> >> strings self.* are defined in the corresponding .pxd
> >>
> >> A branch with the code is on trac: u/dkrenn/cython-str-problem-append
> >> file sage/data_structures/lazy_list.pyx, method __repr__, line 502
> >>
> >> Best Daniel
> >>
> >
>
>
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