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Analysing visit lengths to web site - using cache
Dictionaries example from a Well House Consultants training course
More on Dictionaries [link]

This example references the following resources:
http://www.google.com/se

Source code: visitors Module: Y107

""" 67.174.44.176 - - [12/Aug/2009:03:30:28 +0100] "GET /for
um/Perl-Programming/Perl-Regex-One-Liner-To-Substitute-Multi
line-Text.html HTTP/1.1" 200 74635 "http://www.google.com/se
arch?source=ig&hl=en&rlz=&=&q=perl+oneliner+regex&aq=f&oq=&a
qi=g-s1" "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.2
) Gecko/20090807 Gentoo Firefox/3.5.2" """


import os
import re
when = re.compile(r"(\d\d)/(\w\w\w)/(\d\d\d\d):(\d\d):(\d\d):(\d\d)")

def gelap(t_match):
        return int(t_match[0][3]) * 3600 + \
                int(t_match[0][4]) * 60 + int(t_match[0][5])

class visit:
        def __init__(self,defstring):
                self.detail = [defstring]
                self.cached = 0
        def hit(self,defstring):
                self.detail.append(defstring)
                self.cached = 0
        def getcount(self):
                return (len(self.detail))
        def getduration(self):
                if self.cached:
                        return self.eltime
                self.cached = 1
                self.eltime = 0
                if len(self.detail) < 2:
                        return 0
                startinfo = when.findall(self.detail[0])
                endinfo = when.findall(self.detail[-1])
                thyme = gelap(endinfo) - gelap(startinfo)
                if thyme < -200:
                        thyme += 24 * 3600
                self.eltime = thyme
                return thyme

def byduration(this,that):
        r1 = visitors[this].getduration()
        r2 = visitors[that].getduration()
        return r2 - r1

start_time = os.times()
fh = open("../py/ac_20090812.xyz")
visitors = dict()
for row in fh.xreadlines():
        ip = (row.split(" "))[0]
        if visitors.has_key(ip):
                visitors[ip].hit(row)
        else:
                visitors[ip] = visit(row)

places = visitors.keys()
places.sort(byduration)

end_time = os.times()
for user in places:
   print user,visitors[user].getcount(),visitors[user].getduration()

print start_time
print end_time
Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Python
 * Python Programming
Also available on on site courses for larger groups

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Other Examples
This example comes from our "Dictionaries" training module. You'll find a description of the topic and some other closely related examples on the "Dictionaries" module index page.

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