On Fri, 17 Feb 2017 at 10:23 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. > This is, in my view, one case where Python's existing lambda syntax is perfectly sufficient. (I'd even argue it might be the *only* case...) If you could logger.debug(lambda: expensive_to_compute_message_here), I don't think that the delayed-expression proposal would ever have existed. Ed
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