csv 演習

with open('tokyo-temps.csv', 'r', encoding='shift-jis') as f:
  dataReader = csv.reader(f)
  i = 0
  year = 1875
  years = []
  july_temps = []
  for row in dataReader:
    if i >= 48 and (i-48)%12 == 0:
      years.append(year)
      july_temps.append(row[1])
      year = year + 1
    else:
      pass
    i = i + 1

with open('tokyo-july-temps.csv', 'w', encoding='shift-jis') as f:
  dataWriter = csv.writer(f)
  for year in years:
    dataWriter.writerow([int(year), float(july_temps[years.index(year)])])