python 3

http://greenteapress.com/thinkpython2/code/words.txt

simple answer please

Write a histogram program which counts every letter in words.txt, then outputs each character and its number of occurrences. The output should be in sorted order from least-frequently occurring letter to most-frequently occurring letter. Your program should treat each letter in a case-insensitive fashion which isn't relevant for words.txt but is relevant for many other input files on which such a textual analysis program might be used. Your program should right-justify the counts in a manner similar to my output below, but as always, without using any features we haven't yet studied. You must use a dictionary to store your letter/count pairs, i.e., I do NOT want to see 26 variables, one per letter of the alphabet, in your code! To submit this assignment, upload a file which I can download and execute to test. q1632 j1788 x2780 Z:3758 W:8535 V:9186 k: 937 F: 12714 y13473 b 17798 h 28288 m: 24741 P 25789 g 27848 u 31161 C: 34287 d34552 1 47811 o54542 t: 57859 n: 68513 r: 64965 a: 68582 i 77412 S86547 e: 186758