ex9 count the number in file

9.4 
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.


name = input("Enter file:")
if len(name) < 1 : name = "mbox-short.txt"
handle = open(name)


lst=list()
for line in handle:
    if not line.startswith('From '):continue
    line=line.split
    lst.append(line[1])

counts=dict()


for word in lst:
	counts[word]=counts.get(word,0)+1
            
          
print('cwen@iupui.edu',counts['cwen@iupui.edu'])


## Another way to achieve that:
#counts=dict()
#for line in handle:
#    if line.startswith('From '):
#        words=line.split()
#        for word in words:
#            counts[word]=counts.get(word,0)+1