A try-except demo in class on 2020-10-26.

a-try-except-demo.py

import pandas as pd
import datetime as dt

today = dt.date.today()
day_delta = dt.timedelta(1)
while True:
    try:
        today_str = today.strftime('%m-%d-%Y')
        print("嘗試載入 {} 的資料...".format(today_str))
        csv_url = 'https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_daily_reports/{}.csv'.format(today_str)
        daily_report = pd.read_csv(csv_url)
        print("Congrats! 成功載入了 {} 的資料!".format(today_str))
        break
    except:
        print("Sorry, {} 的資料還找不到 QQ".format(today_str))
        today -= day_delta #today = today - day_delta