如何中断循环以停止程序运行

Question

我正在尝试实施一个程序，在该程序中，我想根据以下标准进行检查，即一旦达到桌子或椅子的数量限制，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。

我希望达到最大数量的桌子或椅子，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 - 如何实现？

我是 python 的新手，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.")

Answer 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;

Answer 2

也许最简单的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.")

Answer 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.")