The python2 stubs for both sqlalchemy and boto are incomplete, which is totally fine! I hope to be able to contribute some time to building them out.

What I think may be a problem is that mypy assumes that the stubs are complete, and so will report that an invocation of a perfectly valid function is an error. Would it be possible to designate various stubs and/or subdirectories as "open"/"incomplete", such that the behavior becomes stub_file.get(key, Any) instead of the current (and correct when stubs are complete) stub_file[key]?