pandas.Series.notnull
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Series.notnull()[source]
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Return a boolean same-sized object indicating if the values are not null. See also - 
 isnull
- boolean inverse of notnull
 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.Series.notnull.html