How do i return a string if a list is empty in python

I’m fairly new to coding, but what this project is asking, is to complete the function so that if a list is empty, it returns the string “does not exist” but currently, it comes up with a bunch of errors. How do I go about adding a function within my lowest_number definition that returns a string if a list is empty (for example, list6)

def lowest_number(num_list):
  lowest = num_list[0]
  for x in num_list:
    if x < lowest:
      lowest = x
  return lowest
  

Answer

This should work. Adding two lines just after you start defining your function.

def lowest_number(num_list):
    if num_list ==[]:
        return "does not exist"
    lowest = num_list[0]
    for x in num_list:
        if x < lowest:
            lowest = x
    return lowest
  
#given lists
list1 = [1, -2, 3]
list2 = [1, 2, 3, 0]
list3 = [10, 20, 30, 40]
list4 = [1.5, 1.2, 1.3]
list5 = [7, 191]
list6 = []

tests = [list1, list2, list3, list4, list5]

for num_list in tests:
    print("The lowest number in", num_list, "is", lowest_number(num_list))
print("The lowest number in", list6, lowest_number(list6))