pandas.DataFrame.to_dense
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DataFrame.to_dense()[source]
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Return dense representation of NDFrame (as opposed to sparse) 
    © 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/0.23.4/generated/pandas.DataFrame.to_dense.html