如何从循环中中断以停止程序运行答案

【问题标题】：How to break from loop to stop program from running如何从循环中中断以停止程序运行
【发布时间】：2020-10-14 15:34:42
【问题描述】：

我正在尝试实现一个程序，我想在其中检查一旦达到桌椅数量限制的标准，循环应该中断并打印最终的打印语句。从逻辑上讲，在第一个 break 语句之后，它会从第一个 for 循环中中断，但不会中断完整的 for 循环并打印最终语句并继续迭代。

我希望那些桌子或椅子达到最大数量，循环应该中断。

知道如何修改吗？如果可以，我可以实现 while 语句吗？如何实现？

我是 python 新手，发现这些练习很有趣，你的帮助会很大。

#variables
number_of_tables = 200
no_of_chairs = 500
for tables in range(0, number_of_tables):
 for chairs in range(0, no_of_chairs):
   prompt = "Bienvenue a la'restaurant"
   answer = input("Please enter for how many people you need a table: ")

   print(f"Welcome family of {answer}, please wait while we take you to your seat")
   number_of_tables -= 1
   no_of_chairs -= int(answer)

   if number_of_tables == 0 or no_of_chairs == 0:
     reply = "Good things need patience. We are full. Please wait in the lobby till a table gets empty. We thank you for understanding"
     print(reply)
     break;

print("Thank you for visiting us.")

【问题讨论】：

标签： python python-3.x for-loop

【解决方案1】：

您可以添加另一个变量来跟踪内部循环中断的事实：

number_of_tables = 200
no_of_chairs = 500
broken = False # this one

for tables in range(0, number_of_tables):
 if broken:
   break # out of the outer loop

 for chairs in range(0, no_of_chairs):
   prompt = "Bienvenue a la'restaurant"
   answer = input("Please enter for how many people you need a table: ")

   print(f"Welcome family of {answer}, please wait while we take you to your seat")
   number_of_tables -= 1
   no_of_chairs -= int(answer)

   if number_of_tables == 0 or no_of_chairs == 0:
     reply = "Good things need patience. We are full. Please wait in the lobby till a table gets empty. We thank you for understanding"
     print(reply)
     broken = True # signal to the outer loop
     break;

【讨论】：

【解决方案2】：

也许最简单的方法就是将它包装在一个函数中：

def waiting(number_of_tables, no_of_chairs):
    for tables in range(0, number_of_tables):
     for chairs in range(0, no_of_chairs):
       prompt = "Bienvenue a la'restaurant"
       answer = input("Please enter for how many people you need a table: ")
    
       print(f"Welcome family of {answer}, please wait while we take you to your seat")
       number_of_tables -= 1
       no_of_chairs -= int(answer)
    
       if number_of_tables == 0 or no_of_chairs == 0:
         reply = "Good things need patience. We are full. Please wait in the lobby till a table gets empty. We thank you for understanding"
         print(reply)
         return
    
    

waiting(200,500)
print("Thank you for visiting us.")

【讨论】：

【解决方案3】：

我会这样做：

#variables
number_of_tables = 200
no_of_chairs = 500

while number_of_tables != 0 and no_of_chairs != 0:
   prompt = "Bienvenue a la'restaurant"
   answer = input("Please enter for how many people you need a table: ")

   print(f"Welcome family of {answer}, please wait while we take you to your seat")
   number_of_tables -= 1
   no_of_chairs -= int(answer)

reply = "Good things need patience. We are full. Please wait in the lobby till a table gets empty. We thank you for understanding"

print(reply)
print("Thank you for visiting us.")

【讨论】：