.py

def get_data(symbol, start, end):
    results = pd.DataFrame()
    while True:
        if start < end:
            # 15m bars
            d = api.polygon.historic_agg_v2(symbol, 15, 'minute', _from=start, to=end, unadjusted=False, limit=None).df
            time.sleep(.2)
            start = d.index[-1].strftime('%Y-%m-%d')
            results = pd.concat([results, d], axis=0)
        else:
            break
    results.drop_duplicates(inplace=True)
    return results