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

Found the magic on http://code.activestate.com/recipes/436482/.

>>> L=[2, 3, 4]
>>> [j for j in [1] for i in L for j in [j*i]][-1]
24

It should be the logic like the following code.

L=[2, 3, 4]
P=[]
for j in [1]:
    for i in L:
        for j in [j*i]:
            P.append(j)
print(P[-1])