TypeError: copy() 在 Python 3.x 中不接受关键字参数

Question

在过去的几个月里，我一直在使用以下代码行没有问题：

a['Area Code']=a['mpan'].str[:2]
a.groupby(a['Area Code'])
a=a[a['Area Code'].astype(int)<=23]

data_list=a.groupby('Area Code')[['mpan']].apply(lambda g: list (map(tuple, g.values.tolist()))).to_dict()

突然间，我从最后一行遇到以下错误：

TypeError: copy() takes no keyword arguments

'a' 是一个 (23,2) 数据框，已按名为“区号”的列分组（并由 SQL 查询填充）。 'data_list' 是一个使用 'Area Code' 列作为键的字典。我有点困惑为什么错误涉及 copy() 而它本身并不在行中。

我对 Python 还是很陌生，并且获得了有关特定行的帮助，因此不确定其基本性质。

Traceback (most recent call last):

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\groupby.py", line 735, in apply
  result = self._python_apply_general(f)

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\groupby.py", line 751, in _python_apply_general
  keys, values, mutated = self.grouper.apply(f, self._selected_obj, self.axis)

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\ops.py", line 171, in apply
  result_values, mutated = splitter.fast_apply(f, group_keys)

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\ops.py", line 925, in fast_apply
  return libreduction.apply_frame_axis0(sdata, f, names, starts, ends)

  File "pandas\_libs\reduction.pyx", line 505, in 
  pandas._libs.reduction.apply_frame_axis0

  TypeError: copy() takes no keyword arguments

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):

  File "<ipython-input-31-84e07b1b1635>", line 1, in <module>
  a.groupby('Area Code')[['mpan']].apply(lambda g: list (map(tuple, 
  g.values.tolist()))).to_dict()

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\groupby.py", line 746, in apply
  return self._python_apply_general(f)

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\groupby.py", line 751, in _python_apply_general
  keys, values, mutated = self.grouper.apply(f, self._selected_obj, self.axis)

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\ops.py", line 171, in apply
  result_values, mutated = splitter.fast_apply(f, group_keys)

  File "C:\ProgramData\Anaconda3\lib\site- 
  packages\pandas\core\groupby\ops.py", line 925, in fast_apply
  return libreduction.apply_frame_axis0(sdata, f, names, starts, ends)

  File "pandas\_libs\reduction.pyx", line 505, in 
  pandas._libs.reduction.apply_frame_axis0

  TypeError: copy() takes no keyword arguments

Answer 1

更新：问题已在Pandas 1.0.1 中修复，您可以安装它，例如使用 pip：

pip install pandas==1.0.1

---

这是一个已知问题（31441 和 31456）：

GroupBy.apply 被提升 TypeError 如果使用返回列表的函数调用 (:issue:31441)

这已在1.0.x 中解决，例如您可以通过pip 安装：

pip install git+ssh://git@github.com/pandas-dev/pandas.git@1.0.x