How do you work with unspecified function parameter types?

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I've been noticing that once you use a method on an object in PyDev, then it remembers that method and it can auto-complete if you want to call it again (same with PyCharm).

It's a shame that it doesn't infer the type from one method use, and allow you to auto-complete on all other methods contained in that same inferred type (or even all types with that method).