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 :

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Answer 1

I complement the answer of Ignacio Vazquez-Abrams with some code that uses the reduce operator of Python.

list_of_numbers = [1, 5, 10, 100]
reduce(lambda x, y: x + y, list_of_numbers)

which can also be written as

list_of_numbers = [1, 5, 10, 100]

def sum(x, y):
    return x + y

reduce(sum, list_of_numbers)

Bonus: Python provides this functionality in the built-in sum function. This is the most readable expression imo.

list_of_numbers = [1, 5, 10, 100]
sum(list_of_numbers)