[Numpy-discussion] f2py function name issues

Sameer Grover sameer.grover.1@gmail....
Fri Mar 9 14:42:05 CST 2012


Thank you very much for the clarification. It would be nice if this
were mentioned in the documentation.

Sameer

On 10 March 2012 01:59, Pauli Virtanen <pav@iki.fi> wrote:
> 09.03.2012 21:05, Sameer Grover kirjoitti:
>> subroutine union ()
>>    write(*,*)'Hello from Fortran90!!!'
>> end subroutine union
>>
>> f2py is unable to wrap this function. Changing the name of the
>> subroutine from 'union' to something else works. I understand that
>> problems like these have been reported a long time ago
>> (http://cens.ioc.ee/pipermail/f2py-users/2003-November/000605.html)
>> with some other function names as well.
>>
>> This looks like a bug to me or is there something I'm missing?
>
> f2py indeed seems to skip names that collide with C keywords. The reason
> probably is that it's not guaranteed that the symbol name is mangled to
> "union_" but it could also become "union". If the name matches a C
> keyword, there's probably no (sane) way to call the function from the C
> language, and since f2py goes through C, it's not able to call that.
>
> Whether this is a real problem in practice or not is then a different
> question.
>
> The full list of "bad" names is
>
> 'int','double','float','char','short','long','void','case','while',
> 'return','signed','unsigned','if','for','typedef','sizeof','union',
> 'struct','static','register','new','break','do','goto','switch',
> 'continue','else','inline','extern','delete','const','auto',
> 'len','rank','shape','index','slen','size','_i',
> 'max', 'min', 'flen','fshape',
> 'string','complex_double','float_double','stdin','stderr','stdout',
> 'type','default'
>
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