[issue19903] Idle: Use inspect.signature for calltips

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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dependencies: +inspect.signature does not support new functools.partialmethod, inspect.signature removes initial starred method params (bug)

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