pyInteger2Words

# Convert an integer to words
# e.g 1234 -> One thousand two hundred and thirty four


def int2words(num):
    w1 = ["", "one ", "two ", "three ", "four ", "five ", "six ", "seven ", "eight ", "nine "]
    w2 = ["", "teen ", "twenty ", "thirty ",  "forty ", "fifty ", "sixty ", "seventy ", "eighty ", "ninety "]
    w3 = ["", "ty", "hundred and ", "thousand ", "ty", "hundred and ", "million ", "ty", "hundred and ", "billion ",]
    w4 = ["ten ", "eleven ", "twelve ", "thirteen ", "fourteen ",
          "fifteen ", "sixteen ", "seventeen ", "eighteen", "nineteen"]
    res = ""
    if num >= 9999999999:
        return "Integer is too large"
    snum = str(num)
    i = 0
    while i < len(snum):        # iterates left to right
        j = len(snum) - i - 1
        # j counts backwards. j = 1 gets last 2 digits
        a = snum[i]             # one character string
        s1 = w1[int(a)]         # single digit word
        s2 = w3[j]              # order word
        if a == "0" and s2 == "hundred and ":
            s2 = "and "
            if j == 5:
                s2 = ""

        if s2 == "ty":
            s1 = w2[int(a)]     # change s1 to xxxty word
            s2 = ""             # remove order word
        if (j == 1 or j == 4) and a < "2":                  # Last 2 digits "00" through "19"
            i += 1
            j -= 1
            y = int(a + snum[i])               # numeric value of last 2 digits
            if y < 10:
                s1 = w1[y]                     # blank or one through nine
                if y == 0:
                    if s2 != "":
                        print("**********s2=", s2)
                    # s2 = ""
                    if res[-5:] == "and ":     # Remove "and" if nothing following
                       res = res[:-4]
            else:
                s1 = w4[y-10]                   # ten through nineteen
                s2 = ""
            if j == 3 and y > 0:
                s2 = "thousand "
        res += s1
        res += s2
        i += 1
        if j == 3 or j == 0:
            if res[-5:] == " and ":
                res = res[:-5]              # there is nothing following 'and' so remove thw 'and'
    if res == "":
        return("zero")

    return res


tests = [1008017, 1461234, 502, 61234, 4300, 56, 160, 9999, 1000, 1001, 1100, 0, 6011, 2055,
         6, 14, 1000017, 1000000, 22000000, 198765432, 2198765432]

for t in tests:
    print(str(t).ljust(10), int2words(t))