Closed
Description
xref: pandas-dev/pandas#9276
For example:
In [1]: import numpy as np
In [2]: import collections
In [3]: isinstance(3.14, collections.Hashable)
Out[3]: True
In [4]: isinstance(np.float64(3.14), collections.Hashable)
Out[4]: False
On Python 2.7, the last output here is True
(which is the correct value)