I have this all the time at work.

We have large python codebase, all sorts of linters and checks.

Still have developers do something like:

    # we have a list of things
    # but we only need one
    try:
        a_thing = things[0]
    except IndexError:
        pass
    assert isinstance(a_thing, Thing)

Sure maybe it's a junior thing. But it still happens, and the typing doesn't save us. I don't know how to tell juniors to stop doing this