[Uri] lab-functions

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[sh-ih]

Oriol,
Great job on this lab!

Some comments:
On question 5, you could simplify your code by calling the functions you created on the previous two questions:

def oper_all(arr, oper):
    if oper == "+":
        return sum_all(arr)
    elif oper == "*":
        return mult_all(arr)

And great idea to deal with the case of the oper not being either + or *

Keep using such clear names when naming your variables. It makes easier for someone else (and even future you!) to understand your code👍