[issue18642] enhancement for operator 'assert'

[Al Korgun]

Al Korgun added the comment:

Mark Dickinson, #1 if dedug (and type check, respectively, as in this example, and 'raise') isn't needed we just need pyo
>> Python won't execute those asserts at all
that is convenient.

if not isinstance(data, basestring):
    raise TypeError(...)

- here we need additionally check debug variable, use wrapper or something.
#2 'assert' is a good breakpoint (sorry, bad english. not sure if this is what I wanted to say) on its own. And to orientate on check & 'raise' we have to mark it somehow.
#3 Well, the code is shorter, obviously.

R. David Murray, yes, maybe confusing, but I can imagine many ways when it is very convenient.

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<http://bugs.python.org/issue18642>
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