def sum(lst): if len(lst) == 0: result = 0 else: result = lst[0]sum(lst[1:4]) print(result) return result

The function sum takes a list as its argument and returns the sum of the elements in the list.
# Exercise 1
Write a function called `multiply_numbers` which receives a list of numbers and returns the multiplication of the numbers in the list.
For example, multiply_numbers([1,2,3, -1]) should return -6.0

# Exercise 2
Write a function called `capitalize_string` which receives a string as an argument and returns the same string but with the first letter capitalized.
For example, capitalize_string("a") should return "A".
# Exercise 3
Write a function called `sum_numbers` which receives a list of numbers and returns the sum of the numbers in the list.
For example, sum_numbers([1,2,3]) should return 6.
# Exercise 4
Write a function called `sum_numbers_exclude_negatives` which receives a list of numbers and returns the sum of the numbers in the list.
However, if any of the numbers in the list is negative, the function returns 0.
For example, sum_numbers_