Chapter 11

#Exercise 11.1
#import re
#fhand = open('mbox.txt')

#count = 0

#expression = raw_input('Enter a regular expression: ')

#for line in fhand:
#    line = line.rstrip()
#    if re.search(expression, line) :
#        count = count + 1
#count = str(count)
#print 'mbox.txt had ' + count + ' lines that matched ' + expression

#Exercise 11.2

import re

file = raw_input('Enter file: ')

fhand = open (file)
x = 0
y = 0
total = 0
count = 0
for line in fhand:
    line = line.rstrip()
    x = re.findall('New Revision: ([0-9]+)', line)
    if len (x) > 0:
        count = count + 1
        for y in x:
            y = float(y)
            total = total + y

average = total/count

print average