CheckIO - Home Challenge 6 : Speech Module

checkio.1.06.speechModule.py

# CheckIO - Home Challenge 6 : Speech Module
# http://checkio.org

# Stephen's speech module is broken. This module is responsible for his number pronunciation. 
# He has to click to input all of the numerical digits in a figure, so when there are big numbers it can take him a long time. 
# Help the robot to speak properly and increase his number processing speed by writing a new speech module for him. 
# All the words in the string must be separated by exactly one space character. 
# Be careful with spaces -- it's hard to see if you place two spaces instead one.
# Input: A number as an integer.
# Output: The string representation of the number as a string.
# Precondition: 0 < number < 1000


FIRST_TEN  = ["", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
SECOND_TEN = ["ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
OTHER_TENS = ["twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
HUNDRED = "hundred"

def checkio(number):

    if (number > 99): 
        hundredDigit=number//100
        if (number%100 == 0):
            return FIRST_TEN[hundredDigit] + " " + HUNDRED
        return FIRST_TEN[hundredDigit] + " " + HUNDRED + " " + checkio(number - hundredDigit*100)
        
    if (number > 19):
        tenDigit=number//10
        if (number%10 == 0):
            return OTHER_TENS[tenDigit-10]
        return OTHER_TENS[tenDigit-10] + " " + checkio(number - tenDigit*10)
        
    if (number < 10):
        return FIRST_TEN[number]
        
    if (number > 9):
        return SECOND_TEN[number-10]

if __name__ == '__main__':
    #These "asserts" using only for self-checking and not necessary for auto-testing
    assert checkio(4) == 'four', "1st example"
    assert checkio(133) == 'one hundred thirty three', "2nd example"
    assert checkio(12) == 'twelve', "3rd example"
    assert checkio(101) == 'one hundred one', "4th example"
    assert checkio(212) == 'two hundred twelve', "5th example"
    assert checkio(40) == 'forty', "6th example"
    assert not checkio(212).endswith(' '), "Don't forget strip whitespaces at the end of string"