I have to admit that I'm not very familiar with the protocol buffers API
for Python, so hopefully someone more knowledgeable can chime in. But given
that Python does not have a message differencer, I think your best bet
would be to try to use the reflection API to implement something similar.
It should allow you to iterate over the fields for a particular message
type and check for differences between two protos. On this page
<https://developers.google.com/protocol-buffers/docs/pythontutorial> under
"Advanced Usage" there are some hints about how to do this.

On Thu, Sep 15, 2016 at 10:16 AM, Jordan Kaye <jordan.ka...@gmail.com>
wrote:

> Hello all,
>
> I've been searching for the better part of a day without finding much
> information on this topic, so I figured I'd go ahead and ask here.
>
> I'm looking for a way to receive notifications of changes to individual
> Protobuf message instances. I have an application that would like to
> persist the changes of a message through time (event sourcing), and it
> would make things extremely clean if there were some way to accomplish this.
>
> If I were working in C++, it seems that there would at least be the
> possibility of using the message differencer for this (I could copy a
> message before applying some logic to it then run the differencer on the
> the copy and the message after the modification), but the code that I
> currently have is in Python.
>
> I understand that this is probably a very specific use case, but is there
> any way for me to achieve something like this?
>
> Thanks,
> Jordan
>
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