python - 通过一些检查获取一组数字之间的原始输入

Question

我试图让用户输入 2 个数字，这些数字被分成 2 个整数的列表，但不幸的是我似乎无法让它们变成整数，但我也不确定我的支票是否正确将正确终止并返回我需要的东西。

def getlohiint():
    lohilist = []
    lohi = raw_input("Enter min and max number of points to use(e.g., 2 1000): ")
    lohilist = lohi.split()
    for x in lohilist:
        int(x)
    if lohilist[0]<=2 and lohilist[1]<=1000 and lohilist[0]<lohilist[1]:
        break
    else:
        prompt = "%d is not in the range of 2 to 1000; "
        prompt1 = "must be at least 2"
        prompt2 = "must be no higher than 1000"
        if lohilist[0]<2:
            print prompt + prompt1
        elif lohilist[1]>1000:
            print prompt + prompt2
        else:
            print prompt + prompt1 + prompt2
        lohi
    high = lohilist[1]
    low = lohilist[0]
    return(low, high)

Answer 1

您永远不会将 int(x) 的结果分配给任何东西。通过列表理解最容易实现:

lohilist = [int(x) for x in lohi.split()]

请注意，您可以一次分配给多个目标:

low, high = [int(x) for x in lohi.split()]

会将 lohi 中的所有内容转换为整数，并一次性分配给两个变量。

您可能还想在这里测试异常:

def getlohiint():
    while True:
        lohi = raw_input("Enter min and max number of points to use(e.g., 2 1000): ")
        try:
            low, high = [int(x) for x in lohi.split()]
        except ValueError:
            # either not integers or not exactly 2 numbers entered.
            print "You must enter exactly 2 numbers here"
            continue

        if low <= 2 and high <= 1000 and low < high:
            # valid input, return
            return low, high

        if low > 2:
            print 'The minimum must be 2 or lower'
        if high > 1000:
            print 'The maximum must be 1000 or lower'
        if low >= high:
            print 'The maximum must be greater than the minimum'