python - Letter Frequency [closed]

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Write a Python function called hist() which takes a string as an argument, and creates a visual representation of the frequency of its alphabetic letters by printing each letter in uppercase the number of times it appears in the string, with each letter on a separate line, grouped from mo开发者_高级运维st to least.

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A MUCH simpler approach is:

import string
def hist(s):
    d = {}
    for i in s.upper():
        if i.isalpha():
            d[i] = d[i] + 1 if i in d else 1
    for k in sorted(d.keys()):
        print k*d[k]

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Your code is similar, you don't need to read the file.

def hist(inputstr):
    lowlet = inputstr.upper()
    alphas = 'abcdefghijklmnopqrstuvwxyz'.upper()
    occurrences = dict( (letter, 0) for letter in alphas)
    total = 0
    for letter in lowlet:
        if letter in occurrences:
            total += 1
            occurrences[letter] += 1
    letcount = sorted(occurrences.iteritems(),key = lambda x:-x[1])
    for letter, count in letcount:
        if count>0:
             print letter*count