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Fri Jun 11 21:44:28 CEST 1999 · https://mail.python.org/pipermail/python-dev/1999-June/095414.html

> I still don't understand the motivation for making it a builtin instead of a
> method of the types it operates on.  Making it a builtin seems very
> un-object-oriented to me.

Because if you make it a method, every sequence type needs to know
about joining strings.  (This wouldn't be a problem in Smalltalk where 
sequence types inherit this stuff from an abstract sequence class, but 
in Python unfortunately that doesn't exist.)

--Guido van Rossum (home page: http://www.python.org/~guido/)

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[Python-Dev] join()