[issue19903] Idle: Use inspect.signature for calltips

[Louie Lu]

Louie Lu added the comment:

@Terry, the PR is created, it is now serving with signature. The two exception (object not callable, invalid method signature) will return the corresponding message.

The only thing I didn't figure out it how to change the color, so I didn't test for this feature.

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<http://bugs.python.org/issue19903>
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