将字符串百分比转换为浮点数的干净方法是什么? [英] What is a clean way to convert a string percent to a float?

问题描述

我查看了标准库和 StackOverflow，并没有发现类似的问题.那么，有没有办法在不滚动我自己的函数的情况下执行以下操作?如果有人在没有内置方式的情况下编写了漂亮的函数，则可以加分.

I have looked in the standard library and on StackOverflow, and have not found a similar question. So, is there a way to do the following without rolling my own function? Bonus points if someone writes a beautiful function if there is no built in way.

def stringPercentToFloat(stringPercent)
    # ???
    return floatPercent

p1 = "99%"
p2 = "99.5%"
print stringPercentToFloat(p1)
print stringPercentToFloat(p2)

>>>> 0.99
>>>> 0.995

推荐答案

使用 strip('%') ，如:

In [9]: "99.5%".strip('%')
Out[9]: '99.5'               #convert this to float using float() and divide by 100


In [10]: def p2f(x):
    return float(x.strip('%'))/100
   ....: 

In [12]: p2f("99%")
Out[12]: 0.98999999999999999

In [13]: p2f("99.5%")
Out[13]: 0.995

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