ipython pandas TypeError:read_csv()得到了一个意外的关键字参数'delim-whitespace'' [英] ipython pandas TypeError: read_csv() got an unexpected keyword argument 'delim-whitespace''

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问题描述

在尝试ipython.org笔记本时,PYTHON FOR DATA MINING介绍



以下代码:

  data = pd.read_csv(http://archive.ics.uci.edu/ml/machine-learning-databases/auto-mpg/auto-mpg.data-original ,
delim_whitespace = True,header = None,
names = ['mpg','cylinder','displacement','horsepower','weight','acceleration',
' model','origin','car_name'])

产生以下错误:

  TypeError:read_csv()得到一个意外的关键字参数'delim-whitespace'

不幸的是,数据集文件本身并不是真正的csv,我不知道为什么他们使用read_csv()来获取数据。



数据如下所示:

  14.0 8. 454.0 220.0 4354. 9.0 70. 1.雪佛兰黑斑羚

环境是Debian稳定的python / 2.7,带有ipython 0.13。
在这里搜索之后,我意识到它很可能是版本问题,
作为参数'delim-whitespace'可能在pandas库的更高版本中,而不是APT包管理器可用的版本。 / p>

我尝试了几种解决方法,但没有成功。




  • 首先,我尝试通过构建最新的源代码来升级pandas,但我发现我最终会得到一系列其他版本的依赖项,其版本需要升级并最终可能破坏环境。例如,我必须安装Cython,然后它报告它在APT包管理器上再次是
    a版本太旧了,所以我将不得不重建Cython,+其他库/模块等等。


  • 然后看了一下API后,我尝试使用其他参数:
    在调用read_csv()时使用delimiter =''导致
    将引号内的字符串分成几列,

      ValueError:期望9列,第13行得到13 


  • 我尝试使用 read_csv()参数 quotechar ='',如API中所述,但同样无法识别(意外的关键字参数)


  • 最后我尝试使用不同的方式加载文件,

      data = DataFrame()

    data.from_csv(url)

    我有,

      Out [18]:
    < class'pandas.core.frame.DataFrame'>
    索引:405条目,15.0 8. 350.0 165.0 3693. 11.5 70. 1.buick skylark 320至31.0 4. 119.0 82.00 2720. 19.4 82. 1.chevy s-10
    Empty DataFrame

    在[19]中:print(data.shape)
    (0,9)


  • 或者,与from_csv()的w / sep参数,

     在[20]中:data.from_csv(url, sep ='')

    产生错误,

      ValueError:期待31列,第1行得到35 
    在[21]中:print(data.shape)
    (0,9)


  • 另外,使用相同的否定结果:

     在[32]中:data = DataFrame(columns = ['mpg','cylinder','displacement','horsepower','weight','acceleration','model ','origin','car_name'])

    在[33]中:data.from_csv(url,sep =',\ t')Out [33]:
    < class'pandas.core.frame.DataFrame'>
    指数:405条,15.0 8. 350.0 165.0 3693. 11.5 70. 1.buick skylark 320至31.0 4. 119.0 82.00 2720. 19.4 82. 1.chevy s-10
    Empty DataFrame

    在[34]中:data.head()
    Out [34]:
    空DataFrame


  • 我尝试使用ipython3代替
    ,但它无法找到/加载matplotlib,因为对于我的
    系统,python3没有matplotlib。




非常感谢任何有关此问题的帮助。

解决方案

您的代码使用 delim_whitespace ,但错误消息显示 delim-whitespace 。前者存在,后者不存在。



如果数据文件包含

  14.0 8. 454.0 220.0 4354. 9.0 70. 1.雪佛兰黑斑羚

和你一起使用

定义数据

  data = pd.read_csv('data', delim_whitespace = True,header = None,names = ['mpg','cylinder','displacement','horsepower','weight','acceleration','model','origin','car_name'])

然后DataFrame成功解析:

  mpg气缸排量马力重量加速模型\ 
0 14 8 454 220 4354 9 70

原产地car_name
0 1雪佛兰impala

所以你只需将连字符更改为下划线。






请注意,当y ou指定 delim_whitespace = True ,使用纯Python解析器。在这种情况下,我认为没有必要。使用 delimiter = r'\ +'正如史蒂夫霍华德所暗示的那样可能表现更好。 (源代码说,The C引擎更快,而python引擎是
目前功能更完整,但我想 C引擎没有的唯一特性 skipfooter 。)


While trying the ipython.org notebook, "INTRODUCTION TO PYTHON FOR DATA MINING"

The following code:

data = pd.read_csv("http://archive.ics.uci.edu/ml/machine-learning-databases/auto-mpg/auto-mpg.data-original",
               delim_whitespace = True, header=None,
               names = ['mpg', 'cylinders', 'displacement', 'horsepower', 'weight', 'acceleration',
                        'model', 'origin', 'car_name'])

yields the following error:

 TypeError: read_csv() got an unexpected keyword argument 'delim-whitespace'

Unfortunately the dataset file itself is not really csv, and I don't know why they used read_csv() to get its data.

The data looks like this line:

 14.0   8.   454.0      220.0      4354.       9.0   70.  1.    "chevrolet impala"

The environment is python/2.7 on Debian stable w/ ipython 0.13. After searching here, I realize it's mostly likely a version problem, as the argument 'delim-whitespace' maybe in a later version of the pandas library, than the one available to the APT package manager.

I tried several workarounds, without success.

  • First, I tried to upgrade pandas, by building from latest source, but i found i would end up with a cascade of other builds of dependencies whose versions need upgrading and could end up breaking the environment. E.g., I had to install Cython, then it reported it was again a version too old on the APT package manager, so I would have to rebuild Cython, + other libs/modules and so on.

  • Then after looking at the API a bit, I tried using other arguments: using delimiter = ' ' in the call to read_csv() caused it to break up the strings inside quotes into several columns,

    ValueError: Expecting 9 columns, got 13 in row 0
    

  • I tried using the read_csv() argument quotechar='"' , as documented in the API but again it was not recognized (unexpected keyword argument)

  • Finally I tried using a different way to load the file,

    data = DataFrame()
    
    data.from_csv(url)
    

    I got,

    Out[18]: 
    <class 'pandas.core.frame.DataFrame'>
    Index: 405 entries, 15.0   8.   350.0      165.0      3693.      11.5   70.  1."buick skylark 320" to 31.0   4.   119.0      82.00      2720.      19.4   82.  1.   "chevy s-10"
    Empty DataFrame
    
    In [19]: print(data.shape)
    (0, 9)
    

  • alternatively, w/ sep argument to from_csv(),

    In [20]: data.from_csv(url,sep=' ')
    

    yields the error,

    ValueError: Expecting 31 columns, got 35 in row 1
    In [21]: print(data.shape)
    (0, 9)
    

  • Also alternatively, with the same negative result:

    In [32]: data = DataFrame( columns = ['mpg', 'cylinders', 'displacement', 'horsepower', 'weight', 'acceleration','model', 'origin', 'car_name'])
    
    In [33]: data.from_csv(url,sep=', \t')Out[33]: 
    <class 'pandas.core.frame.DataFrame'>
    Index: 405 entries, 15.0   8.   350.0      165.0      3693.      11.5   70.  1."buick skylark 320" to 31.0   4.   119.0      82.00      2720.      19.4   82.  1.   "chevy s-10"
    Empty DataFrame
    
    In [34]: data.head()
    Out[34]: 
    Empty DataFrame
    

  • I tried using ipython3 instead, but it cannot find/load matplotlib as there is not matplotlib for python3 for my system.

Any help with this problem would be greatly appreciated.

解决方案

Your code uses delim_whitespace but the error message says delim-whitespace. The former exists, the latter does not.

If the data file contains

 14.0   8.   454.0      220.0      4354.       9.0   70.  1.    "chevrolet impala"

and you define data with

data = pd.read_csv('data', delim_whitespace = True, header=None, names = ['mpg', 'cylinders', 'displacement', 'horsepower', 'weight', 'acceleration', 'model', 'origin', 'car_name'])

then the DataFrame does get parsed successfully:

   mpg  cylinders  displacement  horsepower  weight  acceleration  model  \
0   14          8           454         220    4354             9     70   

   origin          car_name  
0       1  chevrolet impala  

So you just have change the hyphen to an underscore.


Note that when you specify delim_whitespace=True, the pure Python parser is used. In this case I don't think that is necessary. Using delimiter=r'\s+' as Steve Howard suggests would probably perform better. (The source code says, "The C engine is faster while the python engine is currently more feature-complete", but I think the only feature that the python engine has that the C engine does not is skipfooter.)

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