Obtain ohlcv data with ccxt library in Python

dataframe.py

# consecutive days for ohlcv function
from datetime import datetime, date, timedelta

start_day = "20190101"
start_dt = datetime.strptime(start_day, "%Y%m%d")
end_day = "20200831"
end_dt = datetime.strptime(end_day, "%Y%m%d")
days_num = (end_dt - start_dt).days + 1
datelist = [start_dt + timedelta(days=x) for x in range(days_num)]
datelist = [date.strftime("%Y%m%d") for date in datelist]

df = ohlcv(datelist, 'ETH/BTC', '1h')

# hourly ETH/BTC ohlcv data between Jan 2019 and Aug 2020 from crypto exchange
df.to_csv('data/eth_btc_1hour_2018JanTo2020Aug.csv')