#!/usr/bin/python

# P2PU - Python Programming 101 - Chapter 9 - Working with Files
# Python for Informatics - Chapter 7 - Files
# Exercise 7.2

print '\n# Exercise 7.2\n'
fname =  raw_input('Enter a file name: ')
try:
    ffile = open(fname)
except:
    print 'File', fname, 'cannot be opened!'
    exit()
count = 0
error = 0
dspam = 0.0
confi = 0
for line in ffile:
    if line.find('X-DSPAM-Confidence:') == -1:
        continue
    try:
        val = line[line.find(':')+1:]
        val = val.strip()
        dspam += float(val)
        count += 1
    except:
        error += 1
        continue
print line.upper()
if error > 0: print 'There were %d conversion errors' % error
if count > 0: confi = float(dspam/count)
print 'Average spam confidence: %g' % confi