Let me preface this by saying that I think I "get" the concept of duck-
typing.
However, I still want to sprinkle my code with assertions that, for
example, my parameters are what they're supposed to be -- too often I
mistakenly pass in something I didn't intend, and when that happens, I
want the code to fail as early as possible, so I have the shortest
possible path to track down the real bug. Also, a sufficiently clever
IDE could use my assertions to know the type of my identifiers, and so
support me better with autocompletion and method tips.
So I need functions to assert that a given identifier quacks like a
string, or a number, or a sequence, or a mutable sequence, or a
certain class, or so on. (On the class check: I know about
isinstance, but that's contrary to duck-typing -- what I would want
that check to do instead is verify that whatever object I have, it has
the same public (non-underscore) methods as the class I'm claiming.)
Are there any standard methods or idioms for doing that?
Thanks,
- Joe
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