'''
9.4 Write a program to read through the mbox-short.txt and figure out who has
the sent the greatest number of mail messages. The program looks for 'From '
lines and takes the second word of those lines as the person who sent the mail.
The program creates a Python dictionary that maps the sender's mail address to
a count of the number of times they appear in the file. After the dictionary is
produced, the program reads through the dictionary using a maximum loop
to find the most prolific committer.
'''
name = input("Enter file:")
if len(name) < 1 : name = "mbox-short.txt"
handle = open(name)
from_lines = []
emails = {}

for line in handle:
    line = line.rstrip()
    if line.find('From ') == 0:
        line = line.split(' ')
        email = line[1]
        if email not in emails:
            emails[email] = 1
        else:
            emails[email] += 1

email = ''
count = 0

for key in emails:
    if emails[key] > count:
        count = emails[key]
        email = key

print ("%s %s" % (email, str(count)))
