Take a look at Nick Coglan's "with" proposal: http://groups.google.co.uk/groups?selm=mailman.403.1105274631.22381.python-list%40python.org
It addresses many of the same issues (e.g. easy definition of properties). It is more general, though: while your proposal only applies to keyword arguments in a function call this one can be used to name any part of a complex expression and define it in a suite. I think that a good hybrid solution would be to combine the "with" block with optional use of the ellipsis to mean "all names defined in the with block". See also the thread resulting from Andrey Tatarinov's original proposal (using the keyword "where"): http://groups.google.co.uk/groups?selm=3480qqF46jprlU1%40individual.net Oren -- http://mail.python.org/mailman/listinfo/python-list
