efguess.py

"""
=============================
 The Epic Fail Guessing Game
=============================

The Epic Fail Guessing Game (*efguess*) is a simple number guessing game.

Except you can't win it, of course. That would be silly.

"""

from __future__ import print_function

from collections import namedtuple
from functools import partial
from math import log
from random import randint


# Python 3 compatibility
try:
    raw_input
except NameError:
    raw_input = input


Game = namedtuple('Game', 'low high chances')


class SimpleChecker(object):
    def __init__(self, game, secret=None):
        self.game = game
        if secret is None:
            self.secret = randint(game.low, game.high)
        else:
            self.secret = secret

    def check(self, guess):
        return guess - self.secret

    def answer(self):
        return self.secret


class BisectingChecker(object):
    def __init__(self, game, troll_mode=False):
        if troll_mode and self.player_can_win(game):
            raise ValueError("lol u fail n00b")
        self.game = game
        self.low = game.low
        self.high = game.high

    @staticmethod
    def player_can_win(game):
        """Return True if, given those game parameters, it is possible
        for the player to win."""
        return game.chances >= log(game.high-game.low, 2)

    def check(self, guess):
        if self.low == self.high == guess:
            return 0
        middle = (self.low + self.high) // 2
        if guess <= middle:
            self.low = max(self.low, guess + 1)
            return 1
        else:
            self.high = min(self.high, guess - 1)
            return -1

    def answer(self):
        return randint(self.low, self.high)


def read(prompt, parse):
    while True:
        try:
            return parse(raw_input(prompt).strip())
        except ValueError as ex:
            print(ex)


def int_from_to(low, high):
    def parse(s):
        number = int(s)
        if number < low or number > high:
            raise ValueError("number must be from {0} through {1}".format(low, high))
        return number
    return parse


def play(game, checker):
    print("Welcome to the Epic Fail Guessing Game!")
    print("I'm thinking of a number from {low} to {high}.".format(**game._asdict()))

    def loop():
        for guesses_left in range(game.chances, 0, -1):
            print("\nYou have", guesses_left, "guesses left.")
            guess = read("What is your guess? ", int_from_to(game.low, game.high))
            reply = checker.check(guess)
            if reply < 0:
                print("Lower")
            elif reply > 0:
                print("Higher")
            else:
                print("That's correct!")
                return True
        else:
            # Ran out of guesses
            return False

    if loop():
        print("\nYou won!")
    else:
        print("\nThe number was actually:", checker.answer())
        print("Better luck next time!")


if __name__ == '__main__':
    try:
        game = Game(low=1, high=100, chances=5)
        checker = BisectingChecker(game, troll_mode=True)
        play(game, checker)
    except KeyboardInterrupt:
        pass