On 2017-01-09 04:59, Rustom Mody wrote:
> What happens when the expensive is on an inner generator?
> Something like:
>
> [expensive₂(y) for x in data for y in foo(x)]
>
> [The ₂ representing the 2 or more occurrences in Steven's eg]
Well, if I understand your question correctly, the goal would be to
execute each expensive operation only once, regardless of how many
expensive functions you execute:
[(x, a, b, x+1, a+1, b+1)
for x, a, b
in (
x,
expensive_a(x),
expensive_b(x),
for x
in data
)
# if x > 42 # optionally test against values
]
-tkc
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