sumardagarnirfyrstu.py

import csv 
import time
sample=csv.reader(open("/vedurmaelingar-a-islandi.csv","r"))
# gögnin eru á forminu:
# ["YYYY-mm-dd H:M:S", hámarkshitastig, lágmarkshitastig, úrkoma] dæmi:
# ["2002-04-25 18:00:00", "3.9", "1.8", "0.5"]
frost=[] 
notfrost=[] 
for row in sample:
  aday=time.strptime(row[0],"%Y-%m-%d %H:%M:%S")
  if aday.tm_mon==4 and aday.tm_wday==3 and aday.tm_mday in range(19,26):
  # fimmtudagur í apríl frá 19. til 26.
    try:
      if float(row[2])<0:
        if int(aday.tmyear) not in frost:
          frost.append(int(aday.tm_year))
        else:
          if int(aday.tmyear) not in notfrost:
            notfrost.append(int(aday.tm_year))
    except:
      print("exception: "+row)
# hiti er mældur oft á dag, ár geta hafað lent í notfrost ef ein mæling yfir daginn sýndi hita yfir frostmarki
# filterum því út:
print("Ár sem frusu ekki saman: ")
for year in notfrost:
  if year not in frost:
    print(year)
print("")
print("Ár sem frusu saman: ")
for year in frost:
  print(year)