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Factory for webpage objects
Object Orientation: Design Patterns example from a Well House Consultants training course
More on Object Orientation: Design Patterns [link] Source code: pages.py Module: Q908
# Factory for webpage objects
# 31-222-184-25.static.cloud-ips.co.uk - - [12/May/2013:03:30:21 +0100] "GET /share/diary.html HTTP/1.1" 200 39511 "-" "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.16 (KHTML, like Gecko) Chrome/10.0.648.204 Safari/534.16" class webpage(object): def __init__(self,url,time,remote): self.url = url self.time = time self.remote = remote def geturl(self): return self.url def getshorturl(self): return self.url # Human readable form --- renamed to stop it working for demo! def ddd__str__(self): rz = self.time + " " + self.remote + " " + self.url return rz # System readable form (always used if no __str__ present) def __repr__(self): rz = self.time + " " + self.remote + " " + self.url return rz @staticmethod def factory(infoline): pieces = infoline.split(" ") posn = pieces[6].find("?") if posn < 1: current = webpage(pieces[6],pieces[3],pieces[0]) else: pp = pieces[6].split('?') current = nastywebpage(pp[0],pieces[3],pieces[0],pieces[6]) return current def isnasty(self): return False class nastywebpage(webpage): def __init__(self,url,time,remote,nasty): self.url = url self.time = time self.remote = remote self.nasty = nasty def geturl(self): return self.nasty def isnasty(self): if self.url in nastywebpage.justunpleasant: # just unpleasant URL ;-) return False return True nastywebpage.justunpleasant = ["/resources/ex.php","/resources/ex.php4","/qr/img.php"] plist = [] if __name__ == "__main__": for page in open("ac_20130513"): # Logic on next two lines should be within the class # pieces = page.split(" ") # current = webpage(pieces[6],pieces[3],pieces[0]) current = webpage.factory(page) plist.append(current) for ob in plist: # Uses __str__ print ob print plist for ob in plist: if ob.isnasty(): print ob.geturl() + " --- " + ob.getshorturl() Learn about this subject
This module and example are covered on the following public courses:
* Learning to program in Python * Object Oriented Programming in PHP * Python Programming * Intermediate Python Also available on on site courses for larger groups Books covering this topic
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