def sort_sheet(df_sheet):
    """
    Sort sheet by object name.
    """
    df_sheet = df_sheet.copy()

    # Sort new dataframe
    # old_obj = df_sheet.OBJECT.copy()
    # df_sheet.OBJECT = old_obj.str.upper()
    # df_sheet = df_sheet.sort_values('OBJECT')
    # df_sheet.OBJECT = old_obj  # Will properly map index
    # df_sheet = df_sheet.reset_index(drop=True)

    # Pandas > 1.1 simpler way
    df_sheet = df_sheet.sort_values(
            'OBJECT',
            ignore_index=True,
            key=lambda v: v.str.upper(),
            )

    return df_sheet