pandas.Series.isnull
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Series.isnull()[source] -
Return a boolean same-sized object indicating if the values are NA.
See also
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Series.notna - boolean inverse of isna
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Series.isnull - alias of isna
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isna - top-level isna
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© 2008–2012, AQR Capital Management, LLC, Lambda Foundry, Inc. and PyData Development Team
Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.21.1/generated/pandas.Series.isnull.html