Ceasar

import random


def main():
    while True:
        a, b = random.randint(1, 10), random.randint(1, 10)
        expr = "{} + {}".format(a, b)
        print "What is {}?".format(expr)
        try:
            given_answer = int(raw_input('> '))

Ceasar

"""
Generate a stream of characters that look like rain drops.
"""
import random
import time


class Bullet(object):
    def __init__(self, pos=0, char='*', speed=1):
        self.pos = pos

Ceasar

import collections
import random


def gen_ngrams(letters, n=2):
    ngram = collections.deque([None] * n, n)
    for letter in letters:
        ngram.append(letter)
        yield tuple(ngram)
    ngram.append(None)