My Number Translator | Python Fiddle

def assertAreEqual(actual, expected):
    print "%s: expected %s, was %s" % (expected == actual, expected, actual)
    
def translateNumber(number):
    result = ""
    return translate(number, result)

def translate(number, result):
    if (number is None or number == ""):
        return result + ""
        
    if (len(str(number))) == 2:
		if(number < 20):
			return result + ["ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"][number - 10]
		else:
			result += ["twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"][(number/10)-2]
			if (number % 10 == 0):
				return result
			else:
				return translate(int(str(number)[len(str(number))-1]), result + "-")
            
    if (len(str(number)) == 1):
        return result + ["zero","one","two","three","four","five","six","seven","eight","nine"][number]
    
    
    
assertAreEqual(translateNumber(""), "")
assertAreEqual(translateNumber(None), "")
assertAreEqual(translateNumber(0), "zero")
assertAreEqual(translateNumber(1), "one")
assertAreEqual(translateNumber(9), "nine")
assertAreEqual(translateNumber(10), "ten")
assertAreEqual(translateNumber(15), "fifteen")
assertAreEqual(translateNumber(20), "twenty")
assertAreEqual(translateNumber(22), "twenty-two")

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