10-1

#! /usr/bin/env python3.2
# -*- coding: utf-8 -*-

# main.py
""" Task: Exercise 10.1
    Revise a previous program as follows: Read and parse the “From” lines and
    pull out the addresses from the line. Count the number of messages from
    each person using a dictionary.
    After all the data has been read print the person with the most commits by
    creating a list of (count, email) tuples from the dictionary and then
    sorting the list in reverse order and print out the person who has the most
    commits.

    Sample Line:
    From stephen.marquard@uct.ac.za Sat Jan 5 09:14:16 2008

    Enter a file name: mbox-short.txt
    cwen@iupui.edu 5

    Enter a file name: mbox.txt
    zqian@umich.edu 195
"""

''' Functions '''
def enterFileName():
    """
    The user has to enter a filename.
    Returns fileName
    """
    fileName = None
    while fileName == None:
        # Enter filename
        try:
            fileName = input("Enter the filename: ")
        except:
            print("Invalid input!")
            continue
    return fileName

''' Main '''
# Open file
fileName = enterFileName()
try:
    fhand = open(fileName)
except:
    print("File not found!")
    exit()

sender = dict()
for line in fhand:
    words = line.split()
    # print('Debug:', words)
    if len(words) >= 2 and words[0] == 'From':
        sender[words[1]] = sender.get(words[1], 0) + 1

# Print-out
t = list()
for key in sender:
    t.append((sender[key], key))
    t.sort(reverse=True)
print(t[0][1], t[0][0])

# Close file
try:
    fhand.close()
except:
    exit()