arkuhn commented on code in PR #2929:
URL: https://github.com/apache/thrift/pull/2929#discussion_r1615536315


##########
compiler/cpp/src/thrift/generate/t_py_generator.cc:
##########
@@ -2800,8 +2840,78 @@ string t_py_generator::type_name(t_type* ttype) {
   return ttype->get_name();
 }
 
+string t_py_generator::arg_hint(t_type* type) {
+  if (gen_type_hints_) {
+    return ": " + type_to_py_type(type);
+  }
+
+  return "";
+}
+
+string t_py_generator::member_hint(t_type* type, t_field::e_req req) {
+  if (gen_type_hints_) {
+    if (req != t_field::T_REQUIRED) {
+      return ": typing.Optional[" + type_to_py_type(type) + "]";

Review Comment:
   I believe this would work, but only as of 3.10 (which is EOL in a couple 
months.) Using `typing.*` and `Union` syntax allows us to target all of 3.5 to 
3.12+



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