+#if PY_VERSION_HEX >= 0x03000000
+#define string_check PyUnicode_Check
+#define string_from_python PyUnicode_AsUTF8
+#define string_to_python PyUnicode_FromString
+#else
+#define string_check PyString_Check
+#define string_from_python PyString_AsString
+#define string_to_python PyString_FromString
+#endif
+