Question

print "Welcome to my converter!"
#inches to centimeters
def in_inches(n):
    return(n * 2.54)


#pounds to kilograms
def in_pounds(n):
    return(n * 0.453592)

while True:
    print "Which conversion?"
    print "1 is for in to cm"
    print "2 is for lbs to kg"

    choice = raw_input("?")

    if choice == "1":
        n = raw_input("How many inches?")
        res = in_inches(n)
        print "In %s in we have %s cm." % (n, res)
    elif choice == "2":
        n = raw_input("How many pounds?")
        res = in_pounds(n)
        print str(n) + " is " + str(res) + " Kilograms"
    else:
        print "Invalid choice"

我有这个代码，但是当我将它引入控制台时它无法工作。控制台说：

Traceback (most recent call last):
File "converter.py", line 20, in <module>
res = in_inches(n)
File "converter.py", line 4, in in_inches
return(n * 2.54)
TypeError: can't multiply sequence by non-int of type 'float'

这是什么意思，我该如何解决？提前致谢。 `

Answer 1

n的类型为字符串，您需要将其转换为整数，如下所示：

n = int(raw_input("How many inches?"))

和

n = int(raw_input("How many pounds?"))

raw_input()会返回一个字符串，这就是您需要使用int()将n转换为int的原因。

我在这个简单的转换程序中需要帮助

1 个答案: