Notes:
Threading – why wait for responses?
import threading from urllib.request import urlopen from xml.dom import minidom import time
# extract weather details by grabbing tags from the RSS feed # 'channel' contains all titles that contain weather heading text def ExtractWeather (doc): for node in doc.getElementsByTagName( 'channel' ): for title in node.getElementsByTagName( 'title' ): print (title.firstChild.data) class urlOpenThread (threading.Thread): def __init__ (self, host): threading.Thread.__init__(self) self.host = host def run (self): # open the rss feed and then parse the result into a # web document - add this to end of the results list global results results.append(minidom.parse(urlopen(self.host))) bbc_weather = "http://open.live.bbc.co.uk/weather/feeds/en/" locations = [ "2653941" , "2655603" , "2633352" , "2653822" , "2650752" ] forecast = "/3dayforecast.rss" results = [] startingThreads = threading.activeCount() start = time.time() # create a thread for each url open and start it running for location in locations: urlOpenThread(bbc_weather+location+forecast).start() while threading.activeCount() > startingThreads: pass print ( "Elapsed Time: %s" % (time.time() - start)) for webDoc in results: ExtractWeather(webDoc)
Experiments in Python
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