usingTuples.py

name = raw_input("Enter file:")
if len(name) < 1 : name = "mbox-short.txt"
handle = open(name)
hour = list()
count = dict()
for line in handle:
        if not line.startswith("From ") : continue
        time = line.split()[5]
        hour.append(time.split(":")[0])
for key in hour:
    count[key]=count.get(key,0) + 1
for k,v in sorted(count.items()):
	print k,v