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.
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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