>  From: Nicodemus <nicodemus@[...].br>
>  Subject: Re: [C++-sig] On wrapping vector<pair<string, double> >
>  To: Development of Python/C++ integration <c++-sig@[...].org>
>  Message-ID: <3F7963B7.3030904@[...].br>
>  Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>  
>  It is hard to tell by your description of the problem alone, some code 
>  would help. But try this:
>  
>  py::list py_eval(py::list v)
>  {
>      vector< pair<string, double> > input;
>      int i;
>      int len = py::extract<int>(v.attr("__len__")());
>  ...
Thank you. I have tracked the bug:
I forget to use attr("__len__") to get the length of a list. Actually,
I'm trying to do:
     size_t len = py::extract<size_t> (v);

I have an additional question: How to detect a type of a py::object in
boost.python?

I want to change my function to accept either 'str' or 'list' type.
py_eval(py::object obj) {
   if (type(obj) is 'str') {
      ...
   } else if (type(obj) is 'list' or 'tuple') {
   ...
   }
}

How to do the above statements in c++ code?

Thanks.
-- 
                                     Sincerely yours,
                                            Zhang Le

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