如何继续这个 Python 作业？

Question

Write a program that uses a while loop. Process input that uses a sentinel value to indicate the end of input

Write a program that reads a series of numbers from standard input and prints out the sum of those values. A sentinel value of -999 will indicate the end of the input values. Do not include the sentinel value in the sum.

For example:

Can anyone help me with this? This is what I have tried

user_input = 1
    while user_input = -999:
        user_input = int(input())

Answer 1

You can try this, This code portion will break when it reaches the value till it matches the sentinel.

value = 0
while True:
    old_value, value = value, way_to_new_value
    if value == old_value: break