On 2017-04-06 14:56, Vincent Vande Vyvre wrote:
> With two passes
>
> e = [expensive_calculation(x) for x in data]
> final = [(x, y+1) for x, y in zip(e, e)]
Using a generator it can be done in one pass:
final = [
(value, tmp, tmp+1)
for value, tmp
in (
(x, expensive_calculation(x))
for x in data
)
]
The above makes use of the original value as well at top level
(whether you need it for "if" filtering, or in your final tuple
result). If you don't care, you can discard it
final = [
(tmp, tmp+1)
for tmp
in (
expensive_calculation(x)
for x in data
)
]
-tkc
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