mk.py

from urllib.request import urlopen
from random import randint

def wordListSum(wordList):
    sum = 0
    for word, value in wordList.items():
        sum += value
    return sum

def retrieveRandomWord(wordList):
    randIndex = randint(1, wordListSum(wordList))
    for word, value in wordList.items():
        randIndex -= value
        if randIndex <= 0:
            return word

def buildWordDict(text):
    text = text.replace('\n', ' ')
    text = text.replace('\"', '')

    pubctuation = [',', '.', ';', ':']
    for symbol in pubctuation:
        text = text.replace(symbol, ' '+symbol+' ')
    
    words = text.split(' ')
    words = [word for word in  words if word != '']

    wordDict = {}
    for i in range(1, len(words)):
        if words[i-1] not in wordDict:
            wordDict[words[i-1]] = {}
        if words[i] not in wordDict[words[i-1]]:
            wordDict[words[i-1]][words[i]] = 0
        wordDict[words[i-1]][words[i]] = wordDict[words[i-1]][words[i]]+1

    return wordDict

text = str(urlopen("http://pythonscraping.com/files/inaugurationSpeech.txt").read(), 'utf-8')
wordDict = buildWordDict(text)

length = 100
chain = ''
currentWord = 'I'
for i in range(0, length):
    chain += currentWord+' '
    currentWord = retrieveRandomWord(wordDict[currentWord])
print(chain)