Question

make a python dictionary that counts the number of times each letter occurs in the the book below

book_url = 'http://www.gutenberg.org/cache/epub/2680/pg2680.txt'

Answer 1

Here is the python code to do so. Before looking at the code you must know that in the code below I have only counted the frequency of English letters only. Here I have initialized the dictionary and incremented the respective key-value  as I found a letter.

import urllib.request
url = "http://www.gutenberg.org/cache/epub/2680/pg2680.txt"
file = urllib.request.urlopen(url)

letters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
freqMap = {}
for letter in letters:
    freqMap[letter] = 0
for line in file:
    decoded_line = line.decode("utf-8")
    for i in decoded_line:
        if i in freqMap:
            freqMap[i] = freqMap[i]+1

print("Count of all the letters present are: ")
print(freqMap)