def find_possible(df_canvas):
    """
    finda and return the 'Points Possible' row from a canvas dataframe
    
    Parameters
    ----------

    df_canvas: dataframe
        canvas spreadsheet as dataframe

    Returns
    -------

    possible_row: Series
       points possible as a pandas series object
    """
    possible_row = df_canvas.loc[
        df_canvas["Student"].str.find("Points Possible") > -1]
    possible_row = possible_row.iloc[0,:]
    return possible_row