this is helpful especially since the class im taking is an online course! They didnt have any open for in person classes.
Heres an example of an assignment. Couldnt get it lined up perfectly here but you get the point. """Assignment 3 -- parsing with regex""" import csv import urllib2 import argparse import re import operator import datetime import collections PROJECT_URL = "http://s3.amazonaws.com/cuny-is211-spring2015/weblog.csv" def main(): def download_data(url): """ opens csv from url --accepts a string Tries to connect to url 3 times... if no connection after 3 attempts returns false to main """ counter = 3 while counter > 0: try: response = urllib2.urlopen(url) return response except urllib2.URLError: print 'Unable to connect to server... Trying again, please wait...' counter -= 1 continue return False def data_table(data): """ takes raw csv data from download_data and creates a dictionary keyed to row id""" file_in = csv.reader(data) key = 1 entries = {} for row in file_in: entries[key] = row key += 1 return entries def process_data(table): """ takes dictionary from data_table and returns results to main for output to user 2 loops - first parses images and browsers using regex and stores results in lists - second counts number of hits per browser Returns tuple-- (percent of image hits (float), most popular browser(str), hits per hour (list of ordered tuples descending) """ images = [] browsers = [] brows_count = {'Chrome': 0, 'Firefox': 0, 'MSIE': 0, 'Safari': 0} hours = collections.defaultdict(int) date_format = "%Y-%m-%d %H:%M:%S" for key, row in table.iteritems(): # main loop - regex for images and browsers img_search = (re.findall(r'.gif$|.png$|.jpg$|.jpeg$', row[0], re.I | re.M)) browser_search = (re.findall(r'Chrome/|Firefox/|MSIE|' r'Version/\d.\d.\d\sSafari|Version/\d.\d\s\b[a-z0-9]+/[a-z0-9]+\b\sSafari', row[2], re.I | re.M)) new_date = datetime.datetime.strptime(row[1], date_format) hours[new_date.hour] += 1 # creates a key (if not present)from hour and increments if len(img_search) != 0: # appends to a new list images.append(img_search[0]) if len(browser_search) != 0: # appends to a new list browsers.append(browser_search[0]) for i in browsers: # count number of hits per browser if i[:3] == 'Fir': brows_count['Firefox'] += 1 elif i[:3] == 'Chr': brows_count['Chrome'] += 1 elif i[:3] == 'MSI': brows_count['MSIE'] += 1 else: brows_count['Safari'] += 1 most_used_brows = max(brows_count.iteritems(), key=operator.itemgetter(1)) most_hit_hours = sorted(hours.iteritems(), key=operator.itemgetter(1))[::-1] # reverse stride slice reorder image_percent = (float(len(images))/float(len(table))) * 100 return image_percent, most_used_brows[0], most_hit_hours ## command line script... parser = argparse.ArgumentParser() parser.add_argument("--url", help="url of csv file") args = parser.parse_args() if args.url: try: raw_server_data = download_data(args.url) if not raw_server_data: # returns false, fails to connect print "Cannot connect to server... try again later" else: table = data_table(raw_server_data) results = process_data(table) print "Image requests account for {0}% of all requests".format(results[0]) print "{0} is the most popular browser".format(results[1]) for hour in results[2]: print "Hour {0} has {1} hits".format(hour[0], hour[1]) except ValueError: print 'url is not valid... Program closing' else: print "A url must be entered next to the --url flag... program closing" if __name__ == "__main__": main()
What I'm noticing is that you don't need a semicolon all the time in python. In c++ you do. Python takes less typing to get something done. Sent from my LG-LS720 using Tapatalk
