charcount.py

# displays alphanumeric character count and sum of digits in file

import sys

if len(sys.argv) < 2:
	print "Usage: python charcount.py <input.txt>"
	exit()

f = open(sys.argv[1])

count_dict = {}

for line in f:
	c = line.strip()
	if c in count_dict:
		count_dict[c] = count_dict[c] + 1
	else:
		count_dict[c] = 1

for key in sorted(count_dict):
	print key, ": ", count_dict[key]

total = 0

for i in range(1,9):
	total += i * count_dict[str(i)]

print "Sum: ", total