i. let x = [ 1, 2, 3].map(i => i * 10)

    ii. x = list(map((lambda i: i * 10), [ 1, 2, 3 ]))

    iii. x = [i * 10 for i in [1, 2, 3]]

All these methods are really just multiple sides of the same coin. All I see is different syntax, none looks any better from my point of view and unless there is a clear performance benefit, just use what you are used to, or what your coding standards define.

ii. vs iii. boils down to explicit rather than implicit. iii. is simply easier to understand. I believe most people would also agree that ii. doesn't look particularly nice.

I think in general the comprehension is faster because of how method calls and symbol lookups work in python. For the most part it's just a style thing.

I understand superficially that this works, but can you explain the syntax (or is there a name for this)? So far I've also seen a for loop like

    for i in [1,2,3]:
        ...

Answer to my question: https://docs.python.org/2/tutorial/datastructures.html#list-...