Several of the functions in nanops, including nanmean, nanmedian, and anything using _get_counts will crash when using a 1-dimensional all-nan array when the axis argument is set to 0.
>>> from pandas.core import nanops >>> import bottleneck >>> import numpy as np >>> nanops._USE_BOTTLENECK = False >>> >>> val = np.tile(np.nan, (5,)) >>> >>> bottleneck.nanmean(val, axis=0) nan >>> nanops.nanmean(val, axis=0) TypeError: 'numpy.float64' object does not support item assignment
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