Python type hint for classes that support __getitem__

I want to add type hints to a function that will accept any object with a __getitem__ method. For instance, in

def my_function(hasitems, locator):
    hasitems[locator]

I don't want to restrict hasitems to be a specific type like list or dict. As long as it supports __getitem__, it's an appropriate argument to my_function. How can I annotate its type without being unnecessarily restrictive?

Edit: apparently PyCharm can deduce the appropriate hint in a number of common cases, but not in my actual use case. I can't post the code since it's for work, and I haven't been able to find a nonproprietary minimal example where PyCharm fails. In any case, the original question doesn't reference PyCharm and it is still a valid use case for type hints.