python - 百分比计算不起作用

Question

mark=input("Please enter the mark you received for the test:")
total=input("Please enter the mark the test was out of:")

percentage=(mark*100/total)

print("Your percentage is:"),percentage,"%"

当我在 python 3.3.2 mac 中运行它时，会出现这个错误。

Traceback (most recent call last):
  File "/Users/user1/Desktop/Percentage2.py", line 4, in <module>
    percentage=(mark/total*100)
TypeError: unsupported operand type(s) for /: 'str' and 'str'

我该如何解决？

Answer 1

percentage=(float(mark)*100/float(total))

print("Your percentage is: ",percentage,"%", sep='')

Answer 2

输入返回一个字符串，您正在尝试执行“30”*100/total，字符串无法进行数学计算，请尝试 int(mark) 和 int(total)，然后进行数学运算。

try:
    Mark = int(input("Please enter the mark you received for the test."))
    Total = int(input("Please enter the mark the test was out of."))
    Perc = (Mark*100) / Total
    print("Your Percentage is"+Perc)
except:
    print("Numbers not entered. Please try again")

Answer 3

当您进行“打印”声明时，请执行以下操作：

print ("your percentage is: %p" % (percentage))

此外，您可以使用格式：

print("your percentage is: {0} ".format(percentage))

个人推荐使用格式。