np.array([pd.Series({1:1})]) threw KeyError in numpy 1.17.4 #18023
Description
Hi - this was reported here pandas-dev/pandas#38543 in pandas, am just posting here in case it wasn't reported to you previously.
In short, np.array([pd.Series({1:1})]) works in numpy 1.19.4 but not in numpy 1.17.4
$ mkdir tmp
$ cd tmp/
$ virtualenv venv
$ . venv/bin/activate
$ pip install numpy==1.17.4 pandas==1.1.5
$ python -c 'import numpy; import pandas; print(numpy.array([pandas.Series({1:1})]))'
Traceback (most recent call last):
File "/home/marco/tmp/venv/lib/python3.8/site-packages/pandas/core/indexes/base.py", line 2898, in get_loc
return self._engine.get_loc(casted_key)
File "pandas/_libs/index.pyx", line 70, in pandas._libs.index.IndexEngine.get_loc
File "pandas/_libs/index.pyx", line 101, in pandas._libs.index.IndexEngine.get_loc
File "pandas/_libs/hashtable_class_helper.pxi", line 1032, in pandas._libs.hashtable.Int64HashTable.get_item
File "pandas/_libs/hashtable_class_helper.pxi", line 1039, in pandas._libs.hashtable.Int64HashTable.get_item
KeyError: 0
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/marco/tmp/venv/lib/python3.8/site-packages/pandas/core/series.py", line 882, in __getitem__
return self._get_value(key)
File "/home/marco/tmp/venv/lib/python3.8/site-packages/pandas/core/series.py", line 990, in _get_value
loc = self.index.get_loc(label)
File "/home/marco/tmp/venv/lib/python3.8/site-packages/pandas/core/indexes/base.py", line 2900, in get_loc
raise KeyError(key) from err
KeyError: 0
$ pip install numpy==1.19.4
$ python -c 'import numpy; import pandas; print(numpy.array([pandas.Series({1:1})]))'
[[1]]