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"""This module contains a code example related to

Think Python, 2nd Edition

by Allen Downey

http://thinkpython2.com

Copyright 2015 Allen Downey

License: http://creativecommons.org/licenses/by/4.0/

"""

from __future__ import print_function, division

def most_frequent(s):

"""Sorts the letters in s in reverse order of frequency.

s: string

Returns: list of letters

"""

hist = make_histogram(s)

t = []

for x, freq in hist.items():

t.append((freq, x))

t.sort(reverse=True)

res = []

for freq, x in t:

res.append(x)

return res

def make_histogram(s):

"""Make a map from letters to number of times they appear in s.

s: string

Returns: map from letter to frequency

"""

hist = {}

for x in s:

hist[x] = hist.get(x, 0) + 1

return hist

def read_file(filename):

"""Returns the contents of a file as a string."""

return open(filename).read()

if __name__ == '__main__':

string = read_file('emma.txt')

letter_seq = most_frequent(string)

for x in letter_seq:

print(x)