Part 2 - cache invalidation

weather-extract.py

import time

...

   def __init__(self,id,url,rate) :
      self.url = url
      self.id = id 
      self.ts = 0
      self.rate = int(rate)
      self.refresh()

   def refresh(self) :
    if time.time() - self.ts > self.rate :
      try :
        page = urllib.urlopen(self.url)
        report = page.readline()
        data = report.split(" ")
        self.wind_speed = data[1]
        self.gust_speed = data[2] 
        ...
        self.ts = time.time()
      except :
        pass
    else :
      pass

    def get_baro(self) :
        self.refresh()
        ...