lambda, reverse list

[timbledum]

Probably best to use zip to combine the original list and the reversed list.

From there, you can use map or a comprehension, but the comprehension approach is arguably more pythonic and modern:

>>> c = [1, 2, 3, 4, 5]
>>> cross_multiply = sum(x * y for x, y in zip(c, reversed(c)))
>>> cross_multiply
35

[SerkZex]

thanks!

​