Add py.typed to package

[bonprosoft]

I added py.typed file to mark the package PEP561-compatible.
This would be helpful for static type checkers.

Closes #936

cc: @adityapande-1995

Signed-off-by: Yuki Igarashi [email protected]

[adityapande-1995]

Looks good ! Is there a way we could add a test for this using our CI ?

[bonprosoft]

Is there a way we could add a test for this using our CI?

I'm not sure.
Because py.typed is copied into the package dir by ament_cmake_python, I don't think it is reasonable to check if the file is located in the package directory by pytest, which is for testing python modules.

If such test is highly necessary, let me think about the approach 😃

[aprotyas]

Yes, I agree that PEP561 compatibility shouldn't/can't really be tested like the rest of rclpy's test suite.

Regardless, running CI for this change.

Repos file: https://gist.github.com/aprotyas/af5130e8d82be0011957df611898ca7e
Build args: --packages-above-and-dependencies rclpy
Test args: --packages-above rclpy
Job: https://ci.ros2.org/job/ci_launcher/10341/

• Linux
• Linux-aarch64
• Windows

Edit: warnings look unrelated to this patch.

[ros-discourse]

This pull request has been mentioned on ROS Discourse. There might be relevant details there:

https://discourse.ros.org/t/python-type-checking-in-ros2/28507/1