Question

我有一个作业，我让用户选择随机数，这个程序会找到所有这些数字之间的最小和最大，如果没有输入数字，它会认为它是无效的输入。这是我写的代码：

largest = None
smallest = None

while True:
inp = raw_input("Enter a number: ")

if inp == 'done': break
if len(inp) < 1: break

try:
    num = int(inp)
except:
    print "Invalid input"
    continue

if smallest is None:
    smallest = num
elif inp < smallest:
    smallest = num

if largest is None:
    largest = num
elif inp > largest:
    largest = num

print "Maximum is %r" % (largest)
print "Minimum is %r" % (smallest)

问题是，为什么它不起作用？这是我尝试的一些随机数字，并且有些奇怪。 Here I executed the code in the first part and got weird answers, and I executed it again with different numbers and got it right.

Answer 1

您混淆了<和>，并且您将inp字符串与smallest和largest进行比较而不是{{1} }}

Answer 2

你的缩进是错误的，你犯了很多错误。看看这段代码。在if-then-else中，您必须将num与smallest和largest进行比较，而不是inp。

largest = None
smallest = None

while True:
    inp = raw_input("Enter a number: ")

    if inp == 'done': break
    try:
        num = int(inp)
    except:
        print "Invalid input"
        continue

    print num
    if smallest is None: smallest = num
    elif num < smallest: smallest = num

    if largest is None: largest = num
    elif num > largest: largest = num

print "Maximum is %r" % (largest)
print "Minimum is %r" % (smallest)

在Python 2.7中找到最大和最小的

2 个答案: