mentalmath.py

import math
import random

def convert_num_to_word(num):
    '''given a number, convert to word'''

    d = { 1: 'one', 2: 'two', 3:'three', 4:'four', 5:'five', 6:'six', \
         7:'seven',8:'eight', 9:'nine', 10 : 'ten', 11 : 'eleven', \
         12 : 'twelve', 13: 'thirteen', 14: 'fourteen', \
         15 : 'fifteen', 16 : 'sixteen', 17: 'seventeen', \
         18 : 'eighteen' , 19 : 'nineteen', 20 : 'twenty', 30: 'thirty', \
         40: 'forty', 50: 'fifty', 60: 'sixty', 70: 'seventy', \
         80: 'eighty', 90: 'ninety'}

    if d.has_key(num):
        return d[num]
    else:
        hunds = math.floor(num / 100)
        if 0 < hunds < 10:
            return d[hunds] + " hundred " + convert_num_to_word(num % 100)
        
        #split into tens and ones
        ones = num % 10
        the_string = ones
        tens = math.floor(num / 10) * 10 

        return d[tens] + " " + d[ones]

assert(convert_num_to_word(93) == "ninety three")
assert(convert_num_to_word(12) == "twelve")
assert(convert_num_to_word(67) == "sixty seven")

def plus(first, second):
    '''plus'''
    return first + second

def times(first, second):
    '''times'''
    return first * second

def test_user(func, low, high):
    '''take a function and range for random numbers, ask user questions with
    numbers printed on the screen. if user enters "stop" print out the success
    rate. to do: add in time to completion for each question.'''
    score = attempted = 0
    while True:
        first_num = random.randint(low,high)
        second_num = random.randint(low,high)
        print convert_num_to_word(first_num) + " " + func.__doc__ + " " + \
                convert_num_to_word(second_num) + " is:"
        answer = raw_input()
        if answer in "stop":
            print "Correct:\t" + str(score) + "\nAttempted:\t" + str(attempted) + \
                    "\nPercent:\t" + '{:.1%}'.format(float(score)/attempted)
            break
        the_answer = func(first_num, second_num)
        if int(answer) == the_answer:
            print "Correct!\n"
            score += 1
            attempted += 1
        else:
            print "Incorrect! Answer is " + str(the_answer) + "\n"
            attempted += 1