pandas convert to tuple & float to float64

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the output is:float not float64.

You most store it in a variable.

four_64 = newfour_2['GDPDiff'].astype(np.float64)

As mention you convert with the build tuple() after you have used tolist().

    sixlist = df.to_records().tolist() 
    return tuple(sixlist) # Will return a tuple
answer_six()