def _compute_start_end(df, start, end):
    """
    Compute two dataframes with value for start and end
    Args:
        totals(dataframe):

    Returns: Dataframe, Dataframe

    """
    result = {}
    time_dict = {'start': start, 'end': end}
    totals = df.groupby('date').agg({'value': sum}).reset_index()
    for time_name, time in time_dict.items():
        if not totals[totals['date'] == time['id']].empty:
            value = totals.loc[
                totals['date'] == time['id'], 'value'
            ].values[0]
        else:
            value = 0
        result[time_name] = pd.DataFrame([{
            'value': value,
            'label': time['label'],
            'groups': time['label']
        }])
    return result['start'], result['end']
Compute two dataframes with value for start and end
    Args:
        totals(dataframe):

    Returns: Dataframe, Dataframe