Python：ValueError：float（）的无效文字：
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Python: ValueError: invalid literal for float():
提问by elly
I'm really new with python. So maybe my question is really basic...For my work I'm checking different parameters in a period of time. For the Beginning with Python I wanted to plot a simple List with daily measured Temperature-values for a month. In the List I've three splits like these following structure:
我对python真的很陌生。所以也许我的问题真的很基本......对于我的工作，我正在检查一段时间内的不同参数。对于 Python 的开始，我想绘制一个简单的列表，其中包含一个月内每日测量的温度值。在列表中，我有如下结构的三个拆分：
Day -TAB- Temperature -TAB- Nr
天 -TAB- 温度 -TAB- Nr
My Code:
我的代码：
import pylab as pl
import numpy as np
filename = "u_netCDF_write"
file = open(filename)
NoOfValues = 31
counter=0
data = []
for line in file:
if counter <= NoOfValues:
data.append(line.strip('\n').strip('\t').split(' '))
if len(data[-1]) == 4:
data[-1].pop(3)
counter+=1
x = np.linspace(0,30,31)
data = np.transpose(data)
for i in range(len(data[2])):
data[2][i] = float(data[2][i])-273.15
When I try to plot a Temperature-per-Day-Plot I get the Error-Message:
当我尝试绘制每日温度图时，我收到错误消息：
Traceback (most recent call last):
File ".../.../unetCDFplot.py", line 43, in <module>
data[2][i] = float(data[2][i])-273.15
ValueError: invalid literal for float(): 03.07.2014
It looks like that the Code didn't transpose the Data. Why is that so? Can anybody help me? Thanks!
看起来代码没有转置数据。为什么呢？有谁能够帮助我？谢谢！
采纳答案by elly
I solved my problem! So for anybody who has the same problem, here is what I did: I used
我解决了我的问题！所以对于任何有同样问题的人，这就是我所做的：我用过
print(repr(data))
(thanks to Stephany Dionysio) to check every step in my code and understood that the problem was not the transpose-function, but the empty spaces in every line. After trying different methods to delete the empty spaces I saw that I couldn't delete an array in an array caused by 'data.append'. To get the values I needed I used pop() in the append method:
（感谢 Stephany Dionysio）检查我代码中的每一步，并了解到问题不在于转置函数，而是每一行中的空格。在尝试了不同的方法来删除空格后，我发现我无法删除由“data.append”引起的数组中的数组。为了获得我需要的值，我在 append 方法中使用了 pop()：
data.append(line.strip('\n').strip('\t').split(' ').pop(7))
Now my code works fine. Thank you for your good advices, they put me to the right way! :)
现在我的代码工作正常。谢谢你的好建议，他们让我走上了正确的道路！:)
回答by SZD
I don't know the content of your "u_netCDF_write" file so it is reasonably dificult to debug it. But as the other post shows, it cloud be a non-printing character that's present in the value.
我不知道您的“u_netCDF_write”文件的内容，因此调试它相当困难。但正如另一篇文章所显示的那样，它是一个存在于值中的非打印字符。
See if this helps python ValueError: invalid literal for float()
回答by LegendaryDude
03.07.2014 cannot be a float. It looks like you're using the wrong data from your data list.
03.07.2014 不能是浮点数。看起来您使用了数据列表中的错误数据。
