如何解释特定于我的代码的索引错误

Question

目前我有一个索引错误问题，我想了解一下。

如何解读if len(arr) and (arr.max() >= len_axis or arr.min() < -len_axis):？

即，我不知道它指的是哪个数组，即与我的代码相关的len(arr)或len_axis。

输出：

IndexError                                Traceback (most recent call last)
<ipython-input-27-f9c0ccc07fa7> in <module>
----> 1 Engine_EO4(Input_Data)
<ipython-input-25-7d8bbce39c4d> in Engine_EO4(Input_Data)
234                 col = i
235                 row = y
--> 236                 j.append(ValveCover.iloc[row+6:,[col,col+1,col+2,col+5,col+6,col+9, col+10]])
237                 break
238     df=j[0].astype(float).round(6)
F:ProgramFilesAnacondalibsite-packagespandascoreindexing.py in __getitem__(self, key)
1760                 except (KeyError, IndexError, AttributeError):
1761                     pass
-> 1762             return self._getitem_tuple(key)
1763         else:
1764             # we by definition only have the 0th axis
F:ProgramFilesAnacondalibsite-packagespandascoreindexing.py in _getitem_tuple(self, tup)
2065     def _getitem_tuple(self, tup: Tuple):
2066 
-> 2067         self._has_valid_tuple(tup)
2068         try:
2069             return self._getitem_lowerdim(tup)
F:ProgramFilesAnacondalibsite-packagespandascoreindexing.py in _has_valid_tuple(self, key)
701                 raise IndexingError("Too many indexers")
702             try:
--> 703                 self._validate_key(k, i)
704             except ValueError:
705                 raise ValueError(
F:ProgramFilesAnacondalibsite-packagespandascoreindexing.py in _validate_key(self, key, axis)
2007             # check that the key does not exceed the maximum size of the index
2008             if len(arr) and (arr.max() >= len_axis or arr.min() < -len_axis):
-> 2009                 raise IndexError("positional indexers are out-of-bounds")
2010         else:
2011             raise ValueError(f"Can only index by location with a [{self._valid_types}]")
IndexError: positional indexers are out-of-bounds

Answer 1

您试图调用的索引大于数组的最大长度或小于数组的最小长度。

该错误显示了被调用以执行iloc的包的沿袭。如果您查看ValveCover数据帧的维度，并将它们与您试图在iloc中调用的索引进行比较，您应该能够找到差异。