On Fri, Feb 17, 2017 at 2:22 AM, Stephan Houben <stephan...@gmail.com> wrote: > Proposal: Light-weight call-by-name syntax in Python > > The following syntax > a : b > is to be interpreted as: > a(lambda: b) > > Effectively, this gives a "light-weight macro system" to Python, > since it allows with little syntax to indicate that the argument to > a function is not to be immediately invoked. > > It is a generalization of special-case syntax proposals like > delayed: <expr> > In this proposal, `delayed' can be a normal callable.
Note that this is definitely a different proposal from the original, since the original proposer's goal was to be able to use this with existing, unmodified functions that expect a regular value, not a lambda. I don't really see how that goal can be accomplished without massively revising Python's runtime model, so this doesn't really bother me, but it should be noted :-). Anyway, you might also be interested in: https://mail.python.org/pipermail/python-ideas/2016-November/043590.html which is a similar idea and some more motivating examples, except that it allows for the full richness of Python's call syntax, and passes ASTs rather than lambdas to allow for non-standard evaluation rules. -n -- Nathaniel J. Smith -- https://vorpus.org _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
