我似乎无法摆脱这个程序在 python 上的循环答案

【问题标题】：I can't seem to get out of the loop on this program on python我似乎无法摆脱这个程序在 python 上的循环
【发布时间】：2017-02-08 01:12:48
【问题描述】：

我的第一堂编程课大约有 5 周时间，这对我来说仍然有点困难。我想知道是否有人可以帮助我。

我想我似乎无法弄清楚我在做什么错，在完成 7 天的输入命令后，它又回到了第一天。这是我第一次在这里发帖，所以如果我输入了几乎所有的代码，我深表歉意，我只是为了参考，看看它是否可能在 while 循环之上或之下导致我的程序重复自己。提前感谢您的帮助！

keepgoing = "y"

while keepgoing == "y":


    while True:
        try:
            sundaySales = int(input("Enter Sunday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:

            break

    while True:
        try:
            mondaySales = int(input("Enter Monday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:

            break

    while True:
        try:
            tuesdaySales = int(input("Enter Tuesday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:

            break

    while True:
        try:
            wednesdaySales = int(input("Enter Wednesday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:

            break

    while True:
        try:
            thursdaySales = int(input("Enter Thursday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:

            break

    while True:
        try:
            fridaySales = int(input("Enter Friday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:

            break

    while True:
        try:
            saturdaySales = int(input("Enter Saturday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
        return True
Size=7

Sales=[sundaySales, mondaySales, tuesdaySales, wednesdaySales, thursdaySales, fridaySales, saturdaySales]                  

totalWeeklySales = sundaySales+mondaySales+tuesdaySales+wednesdaySales+thursdaySales+fridaySales+saturdaySales
sentence = "This week's total sales are ${} ". format(totalWeeklySales)
print (sentence)
import totalOutcome
totalOutcome.totalOutcome(totalWeeklySales)

keepGoing = input("Do you want to run this again? (Enter y)= ")

if keepGoing != "y":
    print ("Great job this week!")

【问题讨论】：

以上代码不可能为您运行而没有错误。请确保您的要求与您的实际问题相符。在你这样做之后：你需要跳出封闭的 while 循环，而你似乎从来没有这样做过。
将您的第一个 While 更改为 while。你能正确缩进你的程序吗？
While keepgoing == "y": 不是有效的 Python（注意大写字母），循环体没有缩进。
您是否试图获得无限循环？因为这就是你获得无限循环的方式
问题是您实际发布的代码根本不会运行，但您似乎在询问运行的代码，但不是您期望的那样。因此 - 您发布的代码不是您正在运行的代码。请编辑您的问题，以便它显示您的实际代码。由于问题几乎可以肯定是缩进之一，因此您将代码复制到 Stack Overflow 的方式已经破坏了缩进这一事实使您的问题无法回答。删除这个不成功的副本，再次粘贴您的代码，选择它，然后点击{} 图标。

标签： python loops while-loop

【解决方案1】：

我只是简单地修改了您的代码并重新格式化了一点：

keepgoing = "y"

while keepgoing == "y":

    while True:
        try:
            sundaySales = int(input("Enter Sunday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
            break

    while True:
        try:
            mondaySales = int(input("Enter Monday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
            break

    while True:
        try:
            tuesdaySales = int(input("Enter Tuesday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
            break

    while True:
        try:
            wednesdaySales = int(input("Enter Wednesday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
            break

    while True:
        try:
            thursdaySales = int(input("Enter Thursday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
            break

    while True:
        try:
            fridaySales = int(input("Enter Friday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
            break

    while True:
        try:
            saturdaySales = int(input("Enter Saturday's total sales: $"))
        except ValueError:
            print("Sorry, I didn't understand that.")
            continue
        else:
            break
    Size = 7

    Sales = [sundaySales, mondaySales, tuesdaySales,
             wednesdaySales, thursdaySales, fridaySales, saturdaySales]

    totalWeeklySales = sundaySales + mondaySales + tuesdaySales + \
        wednesdaySales + thursdaySales + fridaySales + saturdaySales
    sentence = "This week's total sales are ${} ". format(totalWeeklySales)
    print (sentence)
     import totalOutcome
     totalOutcome.totalOutcome(totalWeeklySales)

    keepgoing = input("Do you want to run this again? (Enter 'y')= ")

    if keepgoing != "y":
        print ("Great job this week!")

请注意：

变量的命名不好，用sunday_sales比sundaySales好，sales_list比Sales等好。 Naming Conventions
在你计算Saturday sales的末尾的原始代码中有一个return True，实际上它应该是break。（顺便说一句，while True 确实是一种糟糕的做法，请尽可能避免使用它）Why while(true) is bad practice?
代码缩进不正确
变量不一致：keepgoing vs keepGoing
当您输入Do you want to run this again? (Enter 'y')=时，请确保您输入的字符串带有引号"abc"或'abc'，而不是abc，否则会出现错误，因为Python将输入视为raw_input
正如@Lord of dark 所说，循环导入不好，请在文件或函数定义的开头导入（如果有循环导入） Python Importing 和 Circular (or cyclic) imports in Python

【讨论】：

谢谢你，这些是一些很棒的技巧，我真诚地感谢大家的帮助！

【解决方案2】：

以下是一些改进代码的建议：

不要在函数外使用return True。您只能使用return 离开函数。要离开 while 循环，请使用 break
在程序开头导入包（将 import totalOutcome 移到顶部），因此不会在每个循环中都导入。
您应该将结束代码放在 while 循环中。现在你永远不会改变值 keepgoing 所以循环将永远循环：
您不应该为每一天手动编写代码，您应该遍历一个日期列表并将每个结果存储在一个列表中。

这是此代码的更紧凑版本：

days=['Sunday','Monday','Tuesday','Wednesday','Thurday','Friday','Saturday']

while True:
  Sales = []
  for day in days:
    while True:
      try:
        daylySales = int(input("Enter "+day+"'s total sales: $"))
        Sales.append(daylySales)
      except ValueError:
        print("Sorry, I didn't understand that.")
        continue
      else:
        break

  totalWeeklySales = sum(Sales)
  sentence = "This week's total sales are ${} ". format(totalWeeklySales)
  print (sentence)

  keepGoing = input("Do you want to run this again? (Enter y)= ")

  if keepGoing != "y":
      print ("Great job this week!")
      break

我尝试尽可能地保留变量名称。

【讨论】：