pandas.io.formats.style.Styler.highlight_null
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Styler.highlight_null(null_color='red')[source]
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Shade the background null_colorfor missing values.New in version 0.17.1. Parameters: null_color: str Returns: self : Styler 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.io.formats.style.Styler.highlight_null.html