Question

最近我发现了一种在Python 3中测试变量是否为int的方法。它的语法是这样的：

try:
    a = int(a)
except ValueError:
    print("Watch out!  The Index is not a number :o (this probably won't break much in this version, might in later ones though!")
    error = True

然而，当测试多个变量时，很快就会变得很糟糕：

def IntegerChecker(a, b, c, d): #A is Index, B is End Time, C is Distance, D is Speed Limit
    global error
    try:
        a = int(a)
    except ValueError:
        print("Watch out!  The Index is not a number :o (this probably won't break much in this version, might in later ones though!")
        error = True
    try:
        b = int(b)
    except ValueError:
        print("Watch out!  The End Time is not a number :o")
        error = True
    try:
        c = int(c)
    except ValueError:
        print("Watch out!  The Distance is not a number :o")
        error = True
    try:
        d = int(d)
    except ValueError:
        print("Watch out!  The Speed Limit is not a number :o")
        error = True

是否有更简单的方法来测试变量是否为整数，如果不是，则将变量更改为true并向用户打印唯一的消息？

请注意，我是Python中的新手程序员，但如果有一个更复杂的方法来做到这一点，我很想知道。另外，在Stack Exchange的代码审查部分，这会更好吗？

Answer 1

这是我的解决方案

def IntegerChecker(**kwargs): #A is Index, B is End Time, C is Distance, D is Speed Limit
    error = False
    err = {
        'index': ('Watch out!  The Index is not a number :o (this probably '
                  'won\'t break much in this version, might in later ones though!'),
        'end_time': 'Watch out!  The End Time is not a number :o',
        'distance': 'Watch out!  The Distance is not a number :o',
        'speed': 'Watch out!  The Speed Limit is not a number :o'
    }
    for key, value in kwargs.items():
        try:
            int(value)
        except ValueError:
            print(err.get(key))
            error = True
    return error

IntegerChecker(index=a, end_time=b, distance=c, speed=d)

Answer 2

每个变量都不需要单独的try-except块。您可以在一个变量中检查所有变量，如果任何变量是非数字变量exception将被引发并error抛出。

def IntegerChecker(a, b, c, d): #A is Index, B is End Time, C is Distance, D is Speed Limit
    global error
    try:
        a = int(a)
        b = int(b)
        c = int(c)
        d = int(d)
    except ValueError:
        print("Watch out!  The Index is not a number :o (this probably won't break much in this version, might in later ones though!")
        error = True

在Python 3中检查多个整数

2 个答案: