NaTType pandas code example
Example: pandas is nattype
In [29]: x = pandas.NaT
In [30]: y = numpy.datetime64('NaT')
In [31]: x != x
Out[31]: True
In [32]: y != y
/home/i850228/.local/lib/python3.6/site-packages/IPython/__main__.py:1: FutureWarning: In the future, NAT != NAT will be True rather than False.
# encoding: utf-8
Out[32]: False