On Mon, Feb 28, 2011 at 11:38 AM, Simon King <simon.k...@uni-jena.de> wrote:
> Hi Robert,
>
> On 28 Feb., 19:56, Robert Bradshaw <rober...@math.washington.edu>
> wrote:
>> If you add a "cdef object __doc__" member to that class, you should be
>> able to assign to it.
>
> I am afraid this is not true.
>
> One is not able to assign it. __doc__ is read only, even if you define
> it cpdef or :
>
> sage: cython('''cdef class C:
> ....: "Documentation of C"
> ....: cpdef object __doc__
> ....: ''')
> sage: c = C()
> sage: c?
> ...
> File: _mnt_local_king__sage_temp_mpc622_11271_tmp_0_spyx_0.pyx
> (starting at line 6) Documentation of C
> sage: c.__doc__='other documentation'
> Traceback (most recent call last)
> ...
> AttributeError: '_mnt_local_king__sage_temp_mpc622_11271_tmp_0_spyx'
> object attribute '__doc__' is read-only
Sorry, I forgot to mention that it must be declared as "cdef public
object __doc__". Otherwise it doesn't create a Python-visible wrapper,
so you're still (from Python) accessing the class-level __doc__.
sage: cython("""cdef class C:
...: cdef public object __doc__""")
sage: c = C()
sage: c.__doc__ = "my doc"
sage: c.__doc__
'my doc'
- Robert
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