pygrametl CSVSource TypeError:init()至少接受2个参数(给定1个) [英] pygrametl CSVSource TypeError: init() takes at least 2 arguments (1 given)

问题描述

我正在尝试使用pygrametl CSVSource，如文档

I am trying to use pygrametl CSVSource as shown in the documentation

这是我的代码

import pygrametl
from pygrametl.datasources import CSVSource

src = CSVSource(csvfile=open('src.csv', 'r', 16384), \
                            delimiter=',')

但是即使我使用了正确的代码，我仍然遇到以下错误.

but I get the following error even though I use the exact code.

TypeError: init ()至少接受2个参数(给定1个参数)

TypeError: init() takes at least 2 arguments (1 given)

我该如何解决?

推荐答案

从您提到的文档中，我们可以看到CSVSource只是对csv模块中的DictReader的引用.

From the documentation You mentioned, we can see that CSVSource is just reference to DictReader from csv module.

如果我们查看DictReader类的源代码(准确地说是__init__方法)，就会看到以下内容:

If we look at the source code of DictReader class (it's __init__ method, to be precise), we see this:

class DictReader:
     def __init__(self, f, fieldnames=None, restkey=None, restval=None,
                  dialect="excel", *args, **kwds):
         self._fieldnames = fieldnames   # list of keys for the dict
         self.restkey = restkey          # key to catch long rows
         self.restval = restval          # default value for short rows
         self.reader = reader(f, dialect, *args, **kwds)
         self.dialect = dialect
         self.line_num = 0

由于输入自变量中没有关键字csvfile，因此此自变量将传递给**kwds，这意味着缺少自变量f.我没有安装此库，但是我认为仅通过open('src.csv', 'r', 16384)而没有csvfile=可以解决此问题.像这样:

Since there is no keyword csvfile in the input arguments, this argument is passed to **kwds, meaning argument f is missing. I don't have this library installed, but I think that just passing open('src.csv', 'r', 16384) without csvfile= will fix this issue. Something like this:

import pygrametl
from pygrametl.datasources import CSVSource

src = CSVSource(open('src.csv', 'r', 16384), delimiter=',')

更新:只需安装pygrametl并在没有csvfile=的情况下进行测试，就可以正常工作.

Update: Just installed pygrametl and tested without csvfile=, it works fine.

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