[Python-Dev] Examples for PEP 572
steve at pearwood.info
Tue Jul 3 22:42:06 EDT 2018
On Tue, Jul 03, 2018 at 09:54:22PM -0400, Terry Reedy wrote:
> > results = [(x, y, x/y) for x in input_data for y in [f(x)] if y > 0]
> Would (f(x),) be faster?
There is a deferred feature request to optimize "for x in [item]" as
equivalent to "for x in (item,)", to avoid constructing a list:
Since it only affects the internal byte-code, not visible semantics
(aside from speed and memory) I think that's a neat micro-optimization
regardless of whether it is applied to comprehensions or regular
for-loops or both.
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