Count letters in a text file

Question

I am a beginner python programmer and I am trying to make a program which counts the numbers of letters in a text file. Here is what I\'ve got so far:

import         


        

Answer 1

Yet another way:

import sys
from collections import defaultdict

read_chunk_size = 65536

freq = defaultdict(int)
for c in sys.stdin.read(read_chunk_size):
    freq[ord(c.lower())] += 1

for symbol, count in sorted(freq.items(), key=lambda kv: kv[1], reverse=True):
    print(chr(symbol), count)

It outputs the symbols most frequent to the least.

The character counting loop is O(1) complexity and can handle arbitrarily large files because it reads the file in read_chunk_size chunks.