A sample implementation of Python 2.7 Gevent parallel hit of 200+ URLs

gevent-network-io-script

import gevent, urllib2


urls = ["http://ppcdn.500px.org/53472962/016dc8008e0e1b0a71437a18ec4ef502c0e69cf6/5.jpg", "http://ppcdn.500px.org/53498178/0d13aa906538a8021568b948edfe3a3b3343dcf2/5.jpg", "http://ppcdn.500px.org/53495988/69d5a868beb9a4610e06ad1d64efa10204f8f45c/5.jpg", "http://ppcdn.500px.org/53488670/be88ee3404909ffb5e0f058133c8cb3cb3c61582/5.jpg", "http://ppcdn.500px.org/53472200/d23ece8bf9ab2f405b396edaf38a6ef77aab0c1e/5.jpg", "http://ppcdn.500px.org/53450310/977ea22beefa8c7148b3155bd829209a3ccf3330/5.jpg", "http://ppcdn.500px.org/53503408/5ed549003f8e919a3bf4b55f1e47dfa76ff77218/5.jpg", "http://ppcdn.500px.org/53496530/4a724f69bb4c1cb5e890594967572584f0c405cc/5.jpg", "http://ppcdn.500px.org/53493274/d55f2a1c0e639888d2ac7f20c04d360a18a75511/5.jpg", "http://ppcdn.500px.org/53478682/60a97a27221b471a00d2ea4c8a080cdf05350865/5.jpg", "http://ppcdn.500px.org/53472206/c99f0f1329f9ba908080cfb20def5fae433163da/5.jpg", "http://ppcdn.500px.org/53470904/5b99c63c3f1d1d19e01e73f49e88d72dc5776dca/5.jpg", "http://ppcdn.500px.org/53487620/514a8bb11650e53a25295e05f13e76069ffe982f/5.jpg", "http://ppcdn.500px.org/53471946/eb4244d152527e5f28199e0f822ffb6f9e7307a5/5.jpg", "http://ppcdn.500px.org/53512606/b46b81f293c18870bc537eb29af41176c364b177/5.jpg", "http://ppcdn.500px.org/53508262/b3f1845372b29b7721d45e16e8696e061a229e1c/5.jpg", "http://ppcdn.500px.org/53502718/3b1ab7097f8f1c6e32034f363680c1e08a37ab73/5.jpg", "http://ppcdn.500px.org/53499444/af5315c17755f7cfcc2c58023ecb553984882ce6/5.jpg", "http://ppcdn.500px.org/53497032/eb94e8f8780d3aca740d5e53ad0585419bb792d9/5.jpg", 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'''
	A simple dict to store a URL & its Content-Length
'''
urlDetails = {}


def hit(url):
	"""
    A Python3.4 asyncio.coroutine which performs a HTTP Head on the given url
    Parameters:
      url - A valid HTTP URI
    """
	# req = urllib.request.Request(url=url,method = 'HEAD')
	# f = urllib.request.urlopen(req)
	request = urllib2.Request(url)
	request.get_method = lambda : 'HEAD'		
	response = urllib2.urlopen(request)
	if response.info() and response.info()["Content-Length"]:
		length = response.info()["Content-Length"]
		print(url, str(length))	
	

gevents = []
for url in urls:	
	print(url)
	try:	
		gevents.append(gevent.spawn(hit(url)))
	except AttributeError,e :
		print(url, "May be later")

gevent.joinall(gevents)