[Python-Dev] PEP 246, redux (original) (raw)

Raymond Hettinger python at rcn.com
Wed Jan 12 01:52:53 CET 2005

Thus, my argument is that an adapter like this should never be made part of the adapter system, even if there's no transitivity. However, if you agree that such an adapter shouldn't be implicit, then it logically follows that there is no problem with allowing transitivity, except of course that people may sometimes break the rule.

At some point, the PEP should be extended to include a list of best practices and anti-patterns for using adapters. I don't find issues of transitivity and implicit conversion to be immediately obvious.

Also, it is not clear to me how or if existing manual adaption practices should change. For example, if I need a file-like interface to a string, I currently wrap it with StringIO. How will that change it the future? By an explicit adapt/conform pair? Or by strings knowing how to conform to file-like requests?

Raymond Hettinger

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