Question

number1 = float
number2 = float


number1 = raw_input("Please input the first number: ")
number2 = raw_input("Please input the second number: ")


if number1 > number2:
    print number1 + ' is bigger than ' + number2

elif number2 < number1:
    print number2 + ' is bigger than ' + number1

else:
    print 'You did not follow the instructions properly. Goodbye!'


print "\n"
raw_input("Please press enter to exit.")

Answer 1

这些行：

number1 = float
number2 = float

不要将输入变为浮点数。相反，他们只是将变量分配给内置float。

这就是你应该做的事情：

number1 = float(raw_input("Please input the first number: "))
number2 = float(raw_input("Please input the second number: "))

此外，在if语句中，您不能将字符串和浮点数一起添加（尝试这样做会引发TypeError）。有两种方法可以解决这个问题。第一个是str.format：

print '{} is bigger than {}'.format(number1, number2)

第二种是用逗号分隔值：

print number1, 'is bigger than', number2

最后，你的逻辑有点偏。第二个if语句应该是这样的：

elif number1 < number2:

否则，它与第一个if语句的作用相同。

以下是您脚本的固定版本：

number1 = float(raw_input("Please input the first number: "))
number2 = float(raw_input("Please input the second number: "))

if number1 > number2:
    print '{} is bigger than {}'.format(number1, number2)

elif number1 < number2:
    print '{} is bigger than {}'.format(number2, number1)

else:
    print 'You did not follow the instructions properly. Goodbye!'


print "\n"
raw_input("Please press enter to exit.")

Answer 2

您正在比较字符串，这意味着它们将按字典顺序进行比较。

将raw_input的返回值转换为float：

number1 = float(raw_input("Please input the first number: "))
number2 = float(raw_input("Please input the second number: "))

行：

number1 = float
number2 = float

仅存储对float()构造函数的引用。 Python没有类型声明，而那些行 not 意味着这两个名称只应该包含浮点值。

然后，您需要在打印时将浮点数转回字符串;您可以使用print接受多个值来完成此操作的事实：

if number1 > number2:
    print number1, 'is bigger than', number2

elif number2 < number1:
    print number2, 'is bigger than', number1

或者，您可以将raw_input()结果存储为字符串，并在比较时仅将值转为float()：

number1 = raw_input("Please input the first number: ")
number2 = raw_input("Please input the second number: ")


if float(number1) > float(number2):
    print number1 + ' is bigger than ' + number2

elif float(number2) < float(number1):
    print number2 + ' is bigger than ' + number1

程序继续直接使用else语句（Python）

2 个答案: