For example, the binding of an accelerated HyperLogLog implementation only requires tiny amount of work, plus a line in my Makefile:

  PYBIND11_MODULE(_hll, m) {
      m.doc() = "pybind11-powered HyperLogLog"; // optional module docstring
      py::class_<hll_t> (m, "hll")
          .def(py::init<size_t>())
          .def("clear", &hll_t::clear, "Clear all entries.")
          .def("resize", &hll_t::resize, "Change old size to a new size.")
          .def("sum", &hll_t::sum, "Add up results.")
          .def("report", &hll_t::report, "Emit estimated cardinality. Performs sum if not performed, but sum must be recalculated if further entries are added.")
          .def("add", &hll_t::add, "Add a (hashed) value to the sketch.")
          .def("addh_", &hll_t::addh, "Hash an integer value and then add that to the sketch.");
  }