To create python bindings,

Prerequisites:
  https://developers.google.com/protocol-buffers/docs/downloads
  or
  https://grpc.io/docs/quickstart/python.html

Command:
  protoc -I=. --python_out=. --grpc_python_out=. CommandExecutor.proto
  or
  python -m grpc_tools.protoc -I. --python_out=. --grpc_python_out=. CommandExecutor.proto