[Python-Dev] Let's get rid of unbound methods (original) (raw)

Phillip J. Eby pje at telecommunity.com
Tue Jan 4 19:51:42 CET 2005

At 01:36 PM 1/4/05 -0500, Jim Fulton wrote:

duck typing?

AKA latent typing or, "if it walks like a duck and quacks like a duck, it must be a duck." Or, more pythonically:

if hasattr(ob,"quack") and hasattr(ob,"duckwalk"):
     # it's a duck

This is as distinct from both 'if isinstance(ob,Duck)' and 'if implements(ob,IDuck)'. That is, "duck typing" is determining an object's type by inspection of its method/attribute signature rather than by explicit relationship to some type object.

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