mymath.py

def square(number):
    return number*number


def sum_list(list_to_sum):
    sum = 0
    for number in list_to_sum:
        sum  = sum + number
    return sum


def find_a_number(mylist, number_to_find):
    for number in mylist:
        if number == number_to_find:
            return True
    return False