# Step 1: Generate the Stub Files

**Prerequisites**

- Python 3.10 or later. Install Python from <https://www.python.org/downloads/>.

1. Install the Python package manager by running this command in the terminal.

   ```
   pip3 install grpcio grpcio-tools avro requests
   ```

   You can use a different package manager.

2. Clone the GitHub repository for Pub/Sub API from [*https://github.com/forcedotcom/pub-sub-api*](https://github.com/forcedotcom/pub-sub-api). The proto file name is `pubsub_api.proto`.

3. Switch to the python directory.

   ```
   cd python
   ```

4. Generate the stubs for the Pub/Sub API by running this command from the cloned directory.

   ```
   python3 -m grpc_tools.protoc --proto_path=../ pubsub_api.proto --python_out=. --grpc_python_out=.
   ```

   This command generates two files in your current directory: `pubsub_api_pb2.py` and `pubsub_api_pb2_grpc.py`. It also generates client and server code and protocol buffer code for populating, serializing, and retrieving message types.