What will the result of calling sum() on an empty list be?

Calling the sum() function on an empty list will return zero. In Python, the sum() function is designed to add up all the elements in an iterable, like a list or a tuple. When it encounters an empty list, there are no elements to add, so it returns the default value of zero. This is a built-in behavior of the sum() function that reflects the mathematical principle that the sum of no numbers is zero, which aligns with how addition works in mathematics. Thus, the result of sum([]) is simply 0, confirming that the correct answer is zero.