A number synthesizer

synthesis.py

suffixes = ["", "thousand", "million", "billion", "trillion", "quadrillion", "quintillion", "sextillion", "septillion", "octillion", "nonillion", "decillion", "undecillion", "duodecillion", "tredecillion", "quatturodecillion", "quindecillion", "sexdecillion", "septendecillion", "octodecillion", "novemdecillion", "vingtillion"]
numbers = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
teens = ["ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
tens = ["zero", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]

def synth2(n):
    if n == 0:
        return ""
    elif n < 10:
        return numbers[n]
    elif n < 20:
        return teens[n - 10]
    elif n % 10 == 0:
        return tens[int(n / 10)]
    else:
        u = n % 10
        t = int((n - u) / 10)
        return "{} {}".format(tens[t], numbers[u])

def synth3(n):
    if n == 0:
        return ""
    elif n < 100:
        return synth2(n)
    elif n % 100 == 0:
        return "{} hundred".format(numbers[int(n / 100)])
    else:
        return "{} hundred {}".format(numbers[int((n - (n % 100)) / 100)], synth2(n % 100))

def expand(n):
    a = []
    while n:
        a.append(n % 1000)
        n -= a[-1]
        n = int(n / 1000)
    return a

def synthesis(n):
    l = expand(n)
    r = []
    for i in range(len(l)):
        if synth3(l[i]):
            r.reverse()
            if i:
                r.append(suffixes[i])
            r.append(synth3(l[i]))
            r.reverse()
    return " ".join(r)

Test suite:

from synthesis import synthesis

items = [86, 1, 10, 100, 1000666]
for i in range(5):
  fss = "{}: {} = {}"
  print(fss.format(i + 1, items[i], synthesis(items[i])))

@EZLiang (Me!) fixed a typo in "forty".

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This is cool