pandas.DataFrame.isnull
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DataFrame.isnull() -
Return a boolean same-sized object indicating if the values are null.
See also
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notnull - boolean inverse of isnull
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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/0.18.1/generated/pandas.DataFrame.isnull.html
