python: support for size_t args (default value)

modules/python/src2/gen2.py

@@ -228,6 +228,7 @@ gen_template_rw_prop_init = Template("""
 
 simple_argtype_mapping = {
     "bool": ("bool", "b", "0"),
+    "size_t": ("size_t", "I", "0"),
     "int": ("int", "i", "0"),
     "float": ("float", "f", "0.f"),
     "double": ("double", "d", "0"),