Series.
count
Return number of non-NA/null observations in the Series.
Examples
Constructing DataFrame from a dictionary:
>>> df = ks.DataFrame({"Person": ... ["John", "Myla", "Lewis", "John", "Myla"], ... "Age": [24., np.nan, 21., 33, 26]})
Notice the uncounted NA values:
>>> df['Person'].count() 5
>>> df['Age'].count() 4