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Callable instances now return a call tip. Good!
I agree with your analysis of the issue raised by Stephen. The get_argspec function will not fail unexpectedly.
> but typing list.append( resulting in weird behavior: something flashed and the typed text moved down a line.
I get "L.append(object) -> None -- append object to end" as the call tip on Linux. I'm not sure why it didn't work on Win 7. Could an unintentional enter key-press be the culprit?
> A different question is whether the default for callables (as opposed to non-callables) should be nothing or something like 'args unknown' or 'see docs'.
I agree that if the argspec string has no contents after all the code in get_argspec, then it should have a message added. Perhaps the following would be sufficient:
 if hasattr(ob, '__call__'):
 [truncated]
 if not argspec:
 argspec += "Arguments unknown. See docs."
 return argspec