Checking whether data frame is copy or view in Pandas

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Answers from HYRY and Marius in comments!

One can check either by:

  • testing equivalence of the values.base attribute rather than the values attribute, as in:

    df.values.base is df2.values.base instead of df.values is df2.values.

  • or using the (admittedly internal) _is_view attribute (df2._is_view is True).

Thanks everyone!

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