[issue19903] Idle: Use inspect.signature for calltips

[Louie Lu]

Louie Lu added the comment:

And, another case, the __text_signature__ and i.signature() is similar, but not the same:

>>> range.__init__.__text_signature__
'($self, /, *args, **kwargs)'
  ^
>>> str(i.signature(range.__init__))
'(self, /, *args, **kwargs)'

So we can't simply compare-and-eliminate this case.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19903>
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