Version 0.2 of Py script to preprocess tweets

preprocessing02.py

'''The aim is  to take all the tweets of a user and store them in a table.  Do this for all the users and then lets see what we can do with it 
   What you wanna do is that you want to get enough information about a user so that you can profile them better. So , lets get started 
'''
def regexSub(line):
	line = re.sub(regRT,'',line)
	line = re.sub(regAt,'',line)
	line = line.lstrip(' ')
	line = re.sub(regHttp,'',line)
	return line
def userName(line): return line[19:]


import sys,os,itertools,re
data = open(sys.argv[1],'r')
processed = open(sys.argv[2],'w')
global regRT 
regRT = 'RT'
global regHttp 
regHttp = re.compile('(http://)[a-zA-Z0-9]*.[a-zA-Z0-9/]*(.[a-zA-Z0-9]*)?')
global regAt 
regAt = re.compile('@([a-zA-Z0-9]*[*_/&%#@$]*)*[a-zA-Z0-9]*')

for line1,line2,line3 in itertools.izip_longest(*[data]*3):
	line1 = line1[2:]
	line2 = line2[2:]
	line3 = line3[2:]

	try:
		tweet=regexSub(line3)
		user = userName(line2)
	except:
		print 'Line2 is ',line2
		print 'Line3 is',line3
	
	
	processed.write(user.strip("\n")+"\t"+tweet)