在 Try Except 上使用 While 循环

Question

我正在使用 Python 3.4.3。我已经成功地编写了在 for 循环中使用 try except 的代码，以确保我的列表中填充了我正在寻找的数据。我遇到的问题是在发生异常后，当输入导致另一个异常错误时，它不会重复代码以重新提示用户输入。

def getTemperatures():
    times=["00:00","01:00","02:00","03:00","04:00","05:00","06:00","07:00",
       "08:00","09:00","10:00","11:00","12:00","13:00","14:00","15:00",
       "16:00","17:00","18:00","19:00","20:00","21:00","22:00","23:00"]
    hourlyTemperatures=[]*len(times)
    for x in times:
        print(x,"Hours")
        while True:
            try:
                hourlyTemps=eval(input("""Please input your temperature in fahrenheit
                (round to the nearest degree) for this hour:\t"""))
                hourlyTemperatures.append(hourlyTemps)
                print("\n")

            except (NameError,SyntaxError,TypeError):
                print("\n")
                print("You did not input a number.")
                hourlyTemps=eval(input("""Please input your temperature in fahrenheit
                (round to the nearest degree) for this hour:\t"""))
                hourlyTemperatures.append(hourlyTemps)
                print("\n")

            while hourlyTemps<-50 or hourlyTemps>130:
                hourlyTemperatures.remove(hourlyTemps)
                print("That is a temperature outside human habitable environments.")
            hourlyTemps=eval(input("""Please input your temperature in fahrenheit
            (round to the nearest degree) for this hour:\t"""))
            hourlyTemperatures.append(hourlyTemps)
            print("\n")


    print(hourlyTemperatures)

getTemperatures()

我试过将 while 循环放在 for 循环之外，以及在 try 之后但在 except 之前，但我无法让它工作。

这是我测试代码时得到的输出示例：

00:00 Hours
Please input your temperature in fahrenheit
(round to the nearest degree) for this hour:    


You did not input a number.
Please input your temperature in fahrenheit
(round to the nearest degree) for this hour:    
Traceback (most recent call last):
  File "F:.4.3 Python Programming\CS117\Labs\Lab03\GetTemperatures.py", line 11, in getTemperatures
(round to the nearest degree) for this hour:\t"""))
 File "<string>", line 0

^
SyntaxError: unexpected EOF while parsing

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "F:.4.3 Python Programming\CS117\Labs\Lab03\GetTemperatures.py", line 34, in <module>
    getTemperatures()
  File "F:.4.3 Python Programming\CS117\Labs\Lab03\GetTemperatures.py", line 19, in getTemperatures
(round to the nearest degree) for this hour:\t"""))
 File "<string>", line 0

^
SyntaxError: unexpected EOF while parsing

我很感激任何人可能必须提供的关于如何解决这个问题的任何建议。

Answer 1

将else与try语句一起使用，确保只有在没有异常发生时才会执行以下代码。此外，您的代码无法退出 while 循环，因此我建议在您需要退出 while 循环并继续 for 的地方添加 break。此外，检查温度是否在边界内的 while 按照您的说法几乎没有用。在您的代码中，临时文件被附加到列表中，然后运行检查。所以改为这样做：

    while True:
        try:
            hourlyTemps = float(input("""Please input your temperature in fahrenheit
            (round to the nearest degree) for this hour:\t""")) # the eval is unneccesary, the number check is simpler
            if -50 < hourlyTemps < 130:
                hourlyTemperatures.append(hourlyTemps)
                break
        except (TypeError, ValueError):
            print() # putting the \n char is also unneccesary
            print("You did not input a number.")
        print()

就这么简单。如果不清楚，请提出问题。祝你好运！

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