RetroSearch Browse

Tue Jul 3 22:42:06 EDT 2018 · https://mail.python.org/pipermail/python-dev/2018-July/154253.html

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:

https://bugs.python.org/issue32856

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.

-- 
Steve

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://mail.python.org/pipermail/python-dev/2018-July/154253.html below:

[Python-Dev] Examples for PEP 572