pandas.io.formats.style.Styler.applymap
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Styler.applymap(func, subset=None, **kwargs)[source]
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Apply a function elementwise, updating the HTML representation with the result. New in version 0.17.1. Parameters: func : function funcshould take a scalar and return a scalarsubset : IndexSlice a valid indexer to limit datato before applying the function. Consider using a pandas.IndexSlicekwargs : dict pass along to funcReturns: self : Styler 
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    https://pandas.pydata.org/pandas-docs/version/0.20.3/generated/pandas.io.formats.style.Styler.applymap.html