diff --git a/pybind/core/point.cpp b/pybind/core/point.cpp
index e6fb585..193c435 100644
--- a/pybind/core/point.cpp
+++ b/pybind/core/point.cpp
@@ -40,6 +40,12 @@ bool add_point_type(py::module& m)
     using vector_t = vector2<T>;
     using value_t = typename point_t::value_t;
 
+    auto to_str = [](const point_t& p) {
+        std::ostringstream ss;
+        ss << p;
+        return ss.str();
+    };
+
     py::class_<point_t>(m, point_trait<T>::name())
         .def(py::init())
         .def(py::init<value_t, value_t>())
@@ -47,12 +53,8 @@ bool add_point_type(py::module& m)
         .def(py::self != py::self)
         .def("data", &point_t::data)
         .def("components", &point_t::data)
-        .def("__repr__",
-             [](const point_t& p) {
-                 std::ostringstream ss;
-                 ss << p;
-                 return ss.str();
-             })
+        .def("__repr__", to_str)
+        .def("__str__", to_str)
         .def("__getitem__",
              [](const point_t& p, size_t i) {
                  return p[i];
diff --git a/pybind/core/rect.cpp b/pybind/core/rect.cpp
index aeadc76..311f646 100644
--- a/pybind/core/rect.cpp
+++ b/pybind/core/rect.cpp
@@ -19,6 +19,12 @@ namespace py = pybind11;
 void add_rect(py::module& m)
 {
     // size
+    auto to_str = [](const rect& r) {
+        std::ostringstream ss;
+        ss << r;
+        return ss.str();
+    };
+
     py::class_<rect>(m, "rect")
         .def(py::init())
         .def(py::init<rect::point_t, size>())
@@ -38,10 +44,6 @@ void add_rect(py::module& m)
         .def("area", &rect::area)
         .def(py::self == py::self)
         .def(py::self != py::self)
-        .def("__repr__",
-             [](const size& s) {
-                 std::ostringstream ss;
-                 ss << s;
-                 return ss.str();
-             });
+        .def("__repr__", to_str)
+        .def("__str__", to_str);
 }
diff --git a/pybind/core/size.cpp b/pybind/core/size.cpp
index 7ff7f13..defca2d 100644
--- a/pybind/core/size.cpp
+++ b/pybind/core/size.cpp
@@ -17,6 +17,12 @@ namespace py = pybind11;
 
 void add_size(py::module& m)
 {
+    auto to_str = [](const size& s) {
+        std::ostringstream ss;
+        ss << s;
+        return ss.str();
+    };
+
     // size
     py::class_<size>(m, "size")
         .def(py::init())
@@ -31,12 +37,8 @@ void add_size(py::module& m)
         .def(py::self - py::self)
         .def(py::self == py::self)
         .def(py::self != py::self)
-        .def("__repr__",
-             [](const size& s) {
-                 std::ostringstream ss;
-                 ss << s;
-                 return ss.str();
-             });
+        .def("__repr__", to_str)
+        .def("__str__", to_str);
     m.def("maximal_size", &maximal_size);
     m.def("minimal_size", &minimal_size);
     m.def("transpose", &transpose);
diff --git a/pybind/core/vector.cpp b/pybind/core/vector.cpp
index 124a69d..0d4f7bc 100644
--- a/pybind/core/vector.cpp
+++ b/pybind/core/vector.cpp
@@ -39,6 +39,12 @@ bool add_vector_type(py::module& m)
     using vector_t = vector2<T>;
     using value_t = typename vector_t::value_t;
 
+    auto to_str = [](const vector_t& p) {
+        std::ostringstream ss;
+        ss << p;
+        return ss.str();
+    };
+
     py::class_<vector_t>(m, vector_trait<T>::name())
         .def(py::init())
         .def(py::init<value_t, value_t>())
@@ -46,12 +52,8 @@ bool add_vector_type(py::module& m)
         .def(py::self != py::self)
         .def("data", &vector_t::data)
         .def("components", &vector_t::data)
-        .def("__repr__",
-             [](const vector_t& p) {
-                 std::ostringstream ss;
-                 ss << p;
-                 return ss.str();
-             })
+        .def("__repr__", to_str)
+        .def("__str__", to_str)
         .def("__getitem__",
              [](const vector_t& p, size_t i) {
                  return p[i];