[protobuf] pypi package don't have google/protobuf/pyext directory

cann't install this package with PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to protobuf+unsubscr...@googlegroups

[protobuf] create message object and set/get value is slow(python version)

Follow yang's blog, I got amazing speed up on serialize/parse. I found create PB message objects and set/get values are also slow, and not like the serialize/parse, using the cpp implemention(even though import the c extension modul