datetime - Python pandas .isnull() does not work on NaT in object dtype -


i have series:

ser=pd.series([11,22,33,np.nan,np.datetime64('nat')],name='my_series')

the series looks this:

0     11 1     22 2     33 3    nan 4    nan name: my_series, dtype: object

but 1 true null values:

ser.isnull()  0    false 1    false 2    false 3     true 4    false name: my_series, dtype: bool

is bug or how can count correctly null values in pandas series? not help:

ser=ser.replace('nan',np.nan)

thanks!

to around this, can do

series.apply(lambda x: str(x) == "nat")

then can still use np.datetime if want


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