The following program searches for the occurrence of a keyword from a supplied page

search_keyword.py

# This is the script download a page from the server and then search from it the required keyword
import urllib2


def get_all_occurences(page):
	length = len(keyword)
	start_link = page.find(keyword)
	if start_link == -1:
		return None, 0
	end_quote = start_link + length
	url = page[start_link : end_quote]
	return url, end_quote

def print_all_occurences(page):
	while page!=None:
		url, end_pos = get_all_occurences(page)
		if url:
			print "Found ",url
			page = page[end_pos : ]
		else:
			return None, 0

def download_page(html_page):
	sourceFile=urllib2.urlopen(html_page)
	print_all_occurences(sourceFile.read())

link = raw_input("Please Enter the URL to search keyword from:")
keyword = raw_input("Enter the keyword to search in the page:")
download_page(link)