[droid_w]

Agree. I also prefer high level operations that are ought to be optimized by the runtime. Python list comprehensions let you do things that are closer to the "mathematical sum notation" without you having to specify the implementation details. I am not sure how optimized it really is though :)

[alcari]

It's not really optimized. The list comprehension's body gets executed in series, and even if it were threaded, the GIL would forcibly serialize the thread execution while breaking all the code out there that expects in-order processing.