[issue19903] Idle: Use inspect.signature for calltips

[Louie Lu]

Louie Lu added the comment:

But somehow in this case, List have no __text_signature__:

>>> str(i.signature(list))
'(iterable=(), /)'
>>> list.__text_signature__
'(iterable=(), /)'
>>> str(i.signature(List))
'(iterable=(), /)'
>>> List.__text_signature__
>>>

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