Can't install Google Assistant gRPC library for Python - maybe it would be the right title of your post.
BTW what do you think about this:
Google Assistant library for Python
The Google Assistant library for Python is a turnkey solution for anyone who wants to quickly integrate the Assistant into a prototype device. The library is written in Python and is supported on devices with linux-armv7l and linux-x86_64 architectures (like the Raspberry Pi 3 B and Ubuntu desktops).