Can anyone explain the following behaviour to me?
>>> import numpy as np
>>> {np.nan: 5}[np.nan]
5
>>> {float64(np.nan): 5}[float64(np.nan)]
KeyError: nan
Why does it work in the first case, but not in the second? Additionally, I found that the following DOES work:
>>> a ={a: 5}[a]
float64(np.nan)