python - 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 :

list = [1, 2, 3]
product = [magic_here for i in list]

#product is expected to be 6

Code that is doing the same :

def product_of(input):
   result = 1
   for i in input:
      result *= i
   return result

Answer 1

No; a list comprehension produces a list that is just as long as its input. You will need one of Python's other functional tools (specifically reduce() in this case) to fold the sequence into a single value.