bpgergo

import random
import multiprocessing
from itertools import starmap, izip, repeat, imap
from operator import mul

def calc_row_of_product_matrix(a_row, b, izip=izip):
    '''Calculate a row of the product matrix P = A * B
    Arguments:
      a_row is af A
      b is the B matrix

bpgergo

import operator

a = [[1, 2, 3], [4, 5, 6]]
b = [[1, 2], [3, 4], [5, 6]]

def sumprod(row, col):
    return sum(reduce(operator.mul, data) for data in zip(row, col))

r = map(lambda row: map(lambda col: sumprod(row, col), zip(*b)), a)

bpgergo

counts = [[10 for i in xrange(k)] for i in xrange(k)]
bigrams = filter_chars(accepted_chars, ngrams(2, counter(counts)))
for c in open('big.txt').read().decode(enc): bigrams.send(c)

bpgergo

@coroutine
def filter_chars(accepted_chars,target):
    """ A coroutine to filter out unaccepted chars. 
    Accepts one char at a time  """
    while True:
        c = (yield)
        if c.lower() in accepted_chars:
            target.send(c.lower())

@coroutine

bpgergo

def coroutine(func):
    """ A decorator function that takes care 
    of starting a coroutine automatically on call """
    def start(*args,**kwargs):
        coro = func(*args,**kwargs)
        coro.next()
        return coro
    return start

@coroutine