Answer:
def stop_at_four(input_list):
output_list = []
index = 0
while index < len(input_list):
if input_list[index] != 4:
output_list.append(input_list[index])
index += 1
else:
break
return output_list
Explanation:
The function stop_at_four has an argument (input_list) which is the list of numbers we want to test.
The output_list is the list of the new numbers that will be generated.
index=0 is the counter with an initial value of 0
The while loop contains an if statement that ensures that a number that is being checked on the input list which is not equal to 4 is appended to the output_list and the counter increases.
The while loop encounters the break statement once a number 4 appears in the list of numbers.
It returns the output_list which contains numbers without 4.
