Growing pains for typing in Python

> It becomes indispensable when objects from one project needs to be processed by functions from another project and it is possible, even if the developers of either project have never even heard about each other. As long as the objects have the methods that the other projects function is calling on them and those methods represent same kind of logical sense then it will just work.

Anyone got an example of this happening in a non-toy case? Because I've never seen it and I struggle to imagine how it's possible. You would have to be ridiculously lucky for the developers in the two projects to independently choose the exact same name, parameter ordering, etc for every method.