text: import csv
  from datetime import datetime
  
  import matplotlib.pyplot as plt
  
  
  filename = 'data/sitka_weather_2018_simple.csv'
  
  with open(filename) as f:
      reader = csv.reader(f)
      header_row = next(reader)
  
      dates, highs, lows = [], [], []
      for row in reader:
          current_date = datetime.strptime(row[2], '%Y-%m-%d')
          high = int(row[5])
          low = int(row[6])
          dates.append(current_date)
          highs.append(high)
          lows.append(low)
  
  plt.style.use('seaborn')
  plt.rcParams['font.sans-serif'] = ['SimHei']
  fig, ax = plt.subplots()
  ax.plot(dates, highs, c='red', alpha=0.5)
  ax.plot(dates, lows, c='blue', alpha=0.5)
  ax.fill_between(dates, highs, lows, facecolor='blue', alpha=0.1)
  ax.plot(dates, highs, c='red')
  ax.plot(dates, lows, c='blue')
  
  ax.set_title("2018年每日最高温度", fontsize=24)
  
  plt.title("2018年每日最高和最低温度", fontsize=24)
  plt.xlabel('', fontsize=16)
  fig.autofmt_xdate()
  plt.ylabel("Temperature (F)", fontsize=16)
  plt.tick_params(axis='both', which='major', labelsize=16)
  
  plt.show()
  