Here is my C-API proposal 1) PyIndex_Check(obj)
Similar to PyIter_Check(obj) as it just checks for whether or not the object can call nb_index. Actually implemented as a macro. 2) PyObject* PyNumber_Index(obj) Simple interface around nb_index that calls it if possible and returns TypeError if not (or if the result does not end up in an exact int-or-long 3) Py_ssize_t PyNumber_AsSsize_t(obj, err) This converts the object to a Py_ssize_t by using the nb_index call if possible. The err argument is a Python error object and specifies what error should be raised should the conversion from Int-or-Long to Py_ssize_t cause Overflow. If err is NULL, then no error will be raised and the result will be clipped. Other-wise the corresponding error will be set. Internally PyExc_IndexError and PyExc_OverflowError will be the errors used. -Travis _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com