Question

df = pd.read_html('https://en.wikipedia.org/wiki/List_of_S%26P_500_companies')[0][0][1:]

给我以下错误

Traceback (most recent call last):
  File "/Users/shijith/anaconda3/envs/py36/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 2657, in get_loc
    return self._engine.get_loc(key)
  File "pandas/_libs/index.pyx", line 108, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/index.pyx", line 132, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/hashtable_class_helper.pxi", line 1601, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas/_libs/hashtable_class_helper.pxi", line 1608, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 0

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "delete.py", line 76, in <module>
    stock_Symbols = pd.read_html('https://en.wikipedia.org/wiki/List_of_S%26P_500_companies')[0][0]
  File "/Users/shijith/anaconda3/envs/py36/lib/python3.6/site-packages/pandas/core/frame.py", line 2927, in __getitem__
    indexer = self.columns.get_loc(key)
  File "/Users/shijith/anaconda3/envs/py36/lib/python3.6/site-packages/pandas/core/indexes/base.py", line 2659, in get_loc
    return self._engine.get_loc(self._maybe_cast_indexer(key))
  File "pandas/_libs/index.pyx", line 108, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/index.pyx", line 132, in pandas._libs.index.IndexEngine.get_loc
  File "pandas/_libs/hashtable_class_helper.pxi", line 1601, in pandas._libs.hashtable.PyObjectHashTable.get_item
  File "pandas/_libs/hashtable_class_helper.pxi", line 1608, in pandas._libs.hashtable.PyObjectHashTable.get_item
KeyError: 0

df = pd.read_html('https://en.wikipedia.org/wiki/List_of_S%26P_500_companies')[0]工作正常，尝试再次切片时会发生错误。

我正在使用anaconda并在基本环境中安装了python 3.7。但是由于必须使用H20，因此我使用python 3.6创建了一个新环境。

在基本版本中，以上代码正常运行。谁能解释为什么会这样吗？

Answer 1

可能是因为，我使用source activate py36env来激活创建的环境并为其安装了软件包（我使用的是conda 4.6.14）。

conda文档：
  conda activate和conda deactivate仅适用于   conda 4.6和更高版本。对于4.6之前的conda版本，运行：

Windows：activate或deactivate
  Linux和macOS：source activate   或source deactivate

我必须删除该环境并重新创建（conda create -n envname python=3.5 pandas scikit-learn），使用conda activate envname

激活

现在可以正常工作

使用python 3.6创建新环境后，熊猫给出KeyError：0

1 个答案: