Implement PEP 393.
diff --git a/Include/Python.h b/Include/Python.h
index 31c6280..aa1a2b2 100644
--- a/Include/Python.h
+++ b/Include/Python.h
@@ -160,4 +160,9 @@
 #define PyDoc_STR(str) ""
 #endif
 
+#define PY_ARRAY_LENGTH(array) (sizeof(array) / sizeof((array)[0]))
+
+#define PY_MIN(x, y) (((x) > (y)) ? (y) : (x))
+#define PY_MAX(x, y) (((x) > (y)) ? (x) : (y))
+
 #endif /* !Py_PYTHON_H */