Any differences between proto2 and proto3 generated code are highlighted - note that these differences are in the generated code as described in this document, not the base message classes/interfaces, which are the same in both versions. You should read the proto2 language guide and/or proto3 language guide before reading this document. The Python Protocol Buffers implementation is a little different from C++ and Java. In Python, the compiler only outputs code to build descriptors for the gen...
