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Refactoring is probably the one area where good IDEs shine the most.

I was expecting to see some advanced Emacs / vim or whatever texteditors or IDE support for refactoring Go code.

Not just manual extraction of common behavior into a tinier interface.

But I'm more and more impressed by Go and may give it a try one of these days.

I doubt it.

How could anyone refactor something like this in Python

getattr(myobj, 'myprop', None)

Where mypropis dynamically generated?

What do you mean by refactoring a single line?

Eclipse plugin. No refactoring available yet: http://code.google.com/p/goclipse/

Others (afaik- no refactoring available yet): http://go-lang.cat-v.org/text-editors/