Question

Hello: Just a quick question.. I hope.
I am trying to use this program to generate random text from a corpus.. in this case a portion of a book.

I have a text file that is my corpus: (This is the intro, won’t post the whole thing here)

The Project Gutenberg EBook of My Man Jeeves, by P. G. Wodehouse
#27 in our series by P. G. Wodehouse

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etc etc etc

Next I have the class I am trying to use:

import random

class Markov(object):

    def __init__(self, open_file):
        self.cache = {}
        self.open_file = open_file
        self.words = self.file_to_words()
        self.word_size = len(self.words)
        self.database()


def file_to_words(self):
    self.open_file.seek(0)
    data = self.open_file.read()
    words = data.split()
    return words


def triples(self):
    """ Generates triples from the given data string. So if our string were
            "What a lovely day", we'd generate (What, a, lovely) and then
            (a, lovely, day).
    """

    if len(self.words) < 3:
        return

    for i in range(len(self.words) - 2):
        yield (self.words[i], self.words[i+1], self.words[i+2])

def database(self):
    for w1, w2, w3 in self.triples():
        key = (w1, w2)
        if key in self.cache:
            self.cache[key].append(w3)
        else:
            self.cache[key] = [w3]

def generate_markov_text(self, size=25):
    seed = random.randint(0, self.word_size-3)
    seed_word, next_word = self.words[seed], self.words[seed+1]
    w1, w2 = seed_word, next_word
    gen_words = []
    for i in xrange(size):
        gen_words.append(w1)
        w1, w2 = w2, random.choice(self.cache[(w1, w2)])
    gen_words.append(w2)
    return ' '.join(gen_words)

And finally the main that gives the error: “‘Markov’ object has no attribute ‘file_to_words'”

import Class
file_ = open('derp.txt')
markov = Class.Markov(file_)
markov.generate_markov_text()

What is going wrong here? Thanks.

Answer 1

You need to indent the file_to_words method so that it is part of the Markov class. The way you have it at the moment it is a module level function in the Class function. Move everything in the file_to_words method (including the def line) 4 spaces to the right.

Update: The same goes for all the other methods too. Python uses whitespace/indentation to denote scope.