Support MyPy

When I import a module I get a MyPy error from this library, e.g. Cannot find module named google.ads.google_ads.client

Possible solutions:

• Add typing to the client library
• Generate MyPy stub files

Can these be autogenerated easily? I’d be happy to help set this up if not.

[henribru]

Well, since I didn’t get a reply I just went ahead and published a stub package: https://pypi.org/project/google-ads-stubs/

Sadly inference from get_type and get_service isn’t working (read the caveats section). It still gives you autocomplete and type checking if you explicitly state the types though. It should also fix the problem with imports that was the original reason for this issue.

[henribru]

Since a lot of things in this repository are generated from protocol buffers, this is pretty closely related to https://github.com/protocolbuffers/protobuf/issues/2638. There’s actually a tip there about https://github.com/dropbox/mypy-protobuf, which allows you to create type stubs from the protobuf definitions.

I don’t think we can ever use type inference when getting types from string names like client.get_type('CustomerOperation').

This will actually be possible in Python 3.8 using literal types. https://www.python.org/dev/peps/pep-0586/