How to emulate sum() using a list comprehension?

Question

Is it possible to emulate something like sum() using list comprehension ?

For example - I need to calculate the product of all elements in a list :

l         


        

Answer 1

>>> from operator import mul
>>> nums = [1, 2, 3]
>>> reduce(mul, nums)
6

_{On Python 3 you will need to add this import: from functools import reduce}

Implementation Artifact

In Python 2.5 / 2.6 You could use vars()['_[1]'] to refer to the list comprehension currently under construction. This is horrible and should never be used but it's the closest thing to what you mentioned in the question (using a list comp to emulate a product).

>>> nums = [1, 2, 3]
>>> [n * (vars()['_[1]'] or [1])[-1] for n in nums][-1]
6