List Comprehensions Enhancement

[Hannah Schroeter]

Hello!

In article <37D9E932.66F2B0D3 at cosc.canterbury.ac.nz>,
Greg Ewing  <greg at cosc.canterbury.ac.nz> wrote:
>[...]

>print [3 * x for x in nums]
>print [x for x in nums if x > 2]
>print [(i, s) for i in nums for s in strs]
>print [(i, s) for i in nums for s in [f for f in strs if "n" in f]]

The syntax looks a bit verbose, compared to e.g. Haskell's list
comprehension syntax which looks quite similar to the mathematical set
comprehensions:

print [3 * x | x <- nums]
print [x | x <- nums, x > 2]
print [(i,s) | i <- nums, s <- strs]
print [(i,s) | i <- nums, s <- [f | f <- strs, 'n' `elem` f]]

Also, I think there should be a clear separator between the
generators/predicates in your syntax too:

print [(i,s) for i in nums, for s in strs]

or similar.

Nice thing, though :-)

Regards, Hannah.