Write a program to read through a mail log, build a histogram using a dictionary to count how many messages have come from each.Enter file name: mbox-short.txt {'gopal.ramasammycook@gmail.com': 1, 'louis@media.berkeley.edu': 3, 'cwen@iupui.edu': 5, 'antranig@caret.cam.ac.uk': 1, 'rjlowe@iupui.edu': 2, 'gsilver@umich.edu': 3, 'david.horwitz@uct.ac.za': 4, 'wagnermr@iupui.edu': 1, 'zqian@umich.edu': 4, 'stephen.marquard@uct.ac.za': 2, 'ray@media.berkeley.edu': 1} Download the mbox-short.txt file from the txtfiles folder.

Here's a Python program that reads through a mail log, builds a histogram using a dictionary to count how many messages have come from each:

fname = input("Enter file name: ")
try:
    fhand = open(fname)
except:
    print("File not found:", fname)
    exit()

counts = dict()
for line in fhand:
    if line.startswith("From "):
        words = line.split()
        email = words[1]
        counts[email] = counts.get(email, 0) + 1

print(counts)

This program prompts the user to enter the file name, opens the file, and then reads through each line. If a line starts with "From ", it splits the line into words and extracts the email address (which is always the second word in this format of log). It then uses a dictionary to keep a count of how many messages have come from each email address. Finally, it prints out the histogram as a dictionary.