[issue7883] CallTips.py _find_constructor does not work

[Terry J. Reedy]

Terry J. Reedy added the comment:

#12520 deleted _find_constructor in 3.x as it works with, but only with old-style classes (gone in 3.x) and just uses getattr(ob, '__init__', None). I believe the tests in this patch duplicate existing tests at the bottom of CallTips.py (increased from 10 to 30 as part of #12510). I will recheck when I move the existing tests into the new idle_test/test_calltips.py.

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versions: +Python 2.7 -Python 3.1

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