ValueError:无法将字符串转换为float:“." [英] ValueError: could not convert string to float: '.'

问题描述

我有一个这样的字符串(CD_cent)列表:

I have a list of strings (CD_cent) like this:

2.374 2.559 1.204

，我想将这些数字与浮点数相乘.为此，我尝试将字符串列表转换为浮点列表，例如:

and I want to multiply these numbers with a float number. For this I try to convert the list of strings to a list of floats for example with:

CD_cent2=[float(x) for x in CD_cent]

但是我总是收到错误: ValueError:无法将字符串转换为float:'.'.我想这意味着它无法将点转换为浮点(?！)，但是我该如何解决呢?为什么它不识别点?

But I always get the error: ValueError: could not convert string to float: '.'. I guess this means, that it can't convert the dot to a float (?!) But how could I fix this? Why doesn't it recognize the dot?

推荐答案

由于字符串具有多个值，您需要分割每个字符串:

You need to split each string as the string has multiple values:

your_str = "2.374 2.559 1.204"

floats = [float(x) for x in your_str.split(' ')]

有了列表，您可以执行以下操作:

Having a list you can do something like this:

li = [...]
floats = []

for s in li:
    floats.extend([float(x) for x in s.split(' ')])

在您的实际情况下，您只有一个字符串 CD_cent = 2.374 2.559 1.204 ，因此您可以:

In your exact situation you have a single string CD_cent = 2.374 2.559 1.204, so you can just:

floats = [float(x) for x in CD_cent.split(' ')]

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