ex-9-4.py

# Write a program to read through the mbox-short.txt and figure out who has 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.

fileHandle = open('mbox-short.txt')

sentAddressCount = dict()

for line in fileHandle:
    if line.startswith('From:'):
        splitLine = line.split()
        sentAddressCount[splitLine[1]] = sentAddressCount.get(splitLine[1], 0) + 1

mostSentAddress = ''
mostSentCount = 0

for key, value in sentAddressCount.items():
    if value > mostSentCount:
        mostSentCount = value
        mostSentAddress = key

print(mostSentAddress, mostSentCount)