[Boost-users] Boost-python wrapping a vector of vectors?

I'm trying to boost-python a vector-of-vectors, like class A { public A(const std::vector>& my_array); }; and would intuitively write the wrapper: BOOST_PYTHON_MODULE(foo) { using namespace boost::python class_<A>("A") .def(init(std::vector()) ; but get the error "a call to a constructor cannot appear in a constant expression" Can anyone supply any guidance as to how to wrap this? Thanks Tim