アルファベット出現頻度確認

letter_frequency.py

import collections, sys
from string import ascii_lowercase
 
def filecharcount(openfile):
    return sorted(collections.Counter(char for line in
                                                 openfile for char in line.lower() ).items())
 
f = open(sys.argv[1])
for letter, repetitions in filecharcount(f):
    print(letter, repetitions)