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Tue Feb 21 11:17:52 CET 2006 · https://mail.python.org/pipermail/python-dev/2006-February/061597.html

Greg Ewing wrote:

>Delaney, Timothy (Tim) wrote:
>
>  
>
>>However, *because* Python uses duck typing, I tend to feel that
>>subclasses in Python *should* be drop-in replacements.
>>    
>>
>
>Duck-typing means that the only reliable way to
>assess whether two types are sufficiently compatible
>for some purpose is to consult the documentation --
>you can't just look at the base class list.
>
>  
>
What's the API for that ?

I've had problems in code that needs to treat strings, lists and
dictionaries differently (assigning values to a container where all
three need different handling) and telling the difference but allowing
duck typing is *problematic*.

Slightly-off-topic'ly-yours,

Michael Foord

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[Python-Dev] defaultdict proposal round three