循环执行功能，直到达到阈值，然后完成脚本

Question

我的任务是循环一个函数，该函数允许虚构的人花费高达100英镑或任何货币，直到100用完为止，在这种情况下脚本才结束。在脚本运行时，它会累加每个值并一直跟踪直到达到阈值！

#This line should initialise a variable
while #I need Finish this line with a loop condition.
  x = int( input("How much is the next item? ") )
  tot = tot+x
print("You cannot afford that!  You only have £" + str(100-(tot-x)) + "

Answer 1

while True:
    do_stuff()
    if you_want_to_stop:
        break

Answer 2

tot = 0
while True:
    x = int( input("How much is the next item? ") )
    if (tot+x)>100:
        print("You cannot afford that!  You only have £ {}".format(str(100-(tot))))
        continue #you want to skip this iteration and repeat
    if tot==100:
        print("You cannot afford more!")
        break #you want to stop
    tot += x