Sorting by letter frequency in Python using defaultdict

letters.py

from collections import defaultdict

def letter_frequency(text):
    freq = defaultdict(int)
    for char in text.replace("\n", ""):
        freq[char] += 1
    return freq

def main():
    text = "The quick brown fox jumps over the lazy dog"

    freq = letter_frequency(text.lower())
    print(sorted(freq.items(), key=lambda i: i[1], reverse=True))

if __name__ == '__main__':
    main()