Sorting and Organization of letter frequency - python -

i'm trying find way count number of occurrences of letters in text file display them in greatest lowest depending upon there frequency. have far, please on brain block.

def me():     info= input("what file select?")     filehandle= open(info,"r")     data=filehandle.read()     case = data.upper()     s=('abcdefghijklmnopqrstuvwxyz')     in range(26):         print(s[i],case.count(s[i]))    me() 

this collections.counter , most_common() method for:

import collections import string  def me():     info = input("what file select? ")     filehandle = open(info, "r")     data = filehandle.read().upper()     char_counter = collections.counter(data)     char, count in char_counter.most_common():         if char in string.ascii_uppercase:             print(char, count)  me() 

a counter dictionary counts number of occurrences of different items (in case, characters). char_counter.most_common() gives pairs of characters , counts in sorted order.

we're interested in letters, check if character in string.ascii_uppercase. string of letters z.