如何使用用户输入创建类实例列表

Question

我正在尝试创建一个程序，该程序允许用户将一个数字（int 而不是 str）传递给一个列表，然后我可以将其传递给三个子类。我有父类 Temperature，子类 Fahrenheit、Celsius 和 Kelvin。目标是让用户输入任意数量的数字，直到他们输入“退出”，然后将这些数字传递给子类，以便我可以根据这些数字调用方法。我有一种感觉，我错过了一些非常简单的东西，但我无法放置它。我是编程新手，所以请善待......

我已经尝试了下面的代码，但是得到了一个 ValuError 并且我似乎无法在不进一步破坏的情况下找到解决方法......

from Temperature import Temperature
from Fahrenheit import Fahrenheit
from Celsius import Celsius
from Kelvin import Kelvin


while True:
    if input == 'quit':
        break
    else:
        temperatures = []
        print ("Fnter a value for each temp, or type 'quit' to finish")
        f = Fahrenheit(input(int('Enter a temp in F: ')))
        temperatures.append(f)
        c = Celsius (input(int('Enter a temp in C: ')))
        temperatures.append(c)
        k = Kelvin (input(int('Enter a temp in K: ')))
        temperatures.append(k)


for temp in temperatures:
    print (temp.get_temp())
    print (temp.above_freezing())
    print (temp.convert_2F())
    print (temp.convert_2C())
    print (temp.convert_2K())
    print ()

因此，根据建议，我已将其更改为：

from Temperature import Temperature
from Fahrenheit import Fahrenheit
from Celsius import Celsius
from Kelvin import Kelvin

temperatures = []

while True:
    if input == 'quit':
        break
    else:
        print ("Enter a value for each temp, or type 'quit' to finish")
        f = Fahrenheit(int(input('Enter a temp in F: ')))
        temperatures.append(f)
        c = Celsius (int(input('Enter a temp in C: ')))
        temperatures.append(c)
        k = Kelvin (int(input('Enter a temp in K: ')))
        temperatures.append(k)


    for temp in temperatures:
        print (temp.get_temp())
        print (temp.above_freezing())
        print (temp.convert_2F())
        print (temp.convert_2C())
        print (temp.convert_2K())
        print ()

现在我明白了：

Enter a value for each temp, or type 'quit' to finish
Enter a temp in F: 5
Enter a temp in C: 5
Enter a temp in K: 5
The current temperature is: 5
(False, '5 degrees Fahrenheit is at or below freezing')
The current temperature is 5 degrees Fahrenheit.
5 degrees Fahrenheit is -15.0 degrees in Celsius.
5 degrees Fahrenheit is 258.15 Kelvin.

The current temperature is: 5
(True, '5 degrees Celsius is above freezing')
5 degrees Celsius is 41.0 degrees in Fahrenheit.
The current temperature is 5 degrees Celsius.
5 degrees Celsius is 278.15 Kelvin.

The current temperature is: 5
(False, '5 Kelvin is at or below freezing')
5 Kelvin is -450.66999999999996 degrees in Fahrenheit.
5 Kelvin is -268.15 degrees in Celsius.
The current temperature is 5 Kelvin.

Enter a value for each temp, or type 'quit' to finish
Enter a temp in F: quit
Traceback (most recent call last):
...line 14, in <module>
f = Fahrenheit(int(input('Enter a temp in F: ')))
ValueError: invalid literal for int() with base 10: 'quit'

当用户输入“退出”时如何消除错误？

Answer 1

from Temperature import Temperature
from Fahrenheit import Fahrenheit
from Celsius import Celsius
from Kelvin import Kelvin

prompt = "\nEnter a number for each temp, and I will give you all the info you need."
prompt += "\n(Don't worry, we'll store all your info as we go along so you don't lose anything)" 
prompt += "\nYou can hit 'Enter' to add numbers or type 'quit' to stop the loop: "

temperatures = []

while True:
    message = input(prompt)
    if message == 'quit':
        break
    else:
        print ("Enter a value for each temp, or enter 'quit' to finish")
        f = Fahrenheit(int(input('Enter a temp in F: ')))
        temperatures.append(f)
        c = Celsius (int(input('Enter a temp in C: ')))
        temperatures.append(c)
        k = Kelvin (int(input('Enter a temp in K: ')))
        temperatures.append(k)


    for temp in temperatures:
        print (temp.get_temp())
        print (temp.above_freezing())
        print (temp.convert_2F())
        print (temp.convert_2C())
        print (temp.convert_2K())
        print ()