[issue20544] Use specific asserts in operator tests

[Terry J. Reedy]

Terry J. Reedy added the comment:

The generic error message for the first is 'False is not true'. Clear but useless. The error message for the second is the more specific '<representation of object)> is not None'. Since the expression was supposed to evaluate to None, but did not, it would be helpful to me, at least, to know what it did evaluate to.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20544>
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