273inttoeng.py

from typing import List

dictionaryForObscureNumbersThatNeedNaming = {
    0: "Zero",
    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",
}


class Solution:

    def numberToWords(self, num: int) -> str:
        if num == 0:
            return "Zero"
        return self.splitNum(num)

    def splitNum(self, num: int):
        if num <= 20:
            if num != 0:
                return dictionaryForObscureNumbersThatNeedNaming[num]
            else:
                return ''
        if num < 10**2:
            tens = num // 10 * 10
            ones = num % 10
            print(tens, ones)
            if ones == 0:
                return dictionaryForObscureNumbersThatNeedNaming[tens]

            rN = dictionaryForObscureNumbersThatNeedNaming[
                tens] + ' ' + dictionaryForObscureNumbersThatNeedNaming[ones]
            rN = rN.strip()
            return rN
        if num < 10**3:
            hundreds = num // 100
            ones = num % 100
            hundreds = dictionaryForObscureNumbersThatNeedNaming[hundreds]
            ones = self.splitNum(ones)
            rN = hundreds + ' Hundred ' + ones
            rN = rN.strip()
            return rN

        if num < 10**6:
            thousands = num // 1000
            thousands = self.splitNum(thousands)
            ones = num % 1000
            ones = self.splitNum(ones)
            rN = thousands + ' Thousand ' + ones
            rN = rN.strip()
            return rN

        if num < 10**9:
            millions = num // 10**6
            millions = self.splitNum(millions)
            ones = num % 10**6
            ones = self.splitNum(ones)
            rN = millions + ' Million ' + ones
            rN = rN.strip()
            return rN

        if num < 10**12:
            billions = num // 10**9
            billions = self.splitNum(billions)
            ones = num % 10**9
            ones = self.splitNum(ones)
            rN = billions + ' Billion ' + ones
            rN = rN.strip()
            return rN


def test_():
    solution = Solution()
    assert solution.numberToWords(
        1234567891
    ) == "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One"
    assert solution.numberToWords(30) == "Thirty"
    assert solution.numberToWords(70) == "Seventy"
    assert solution.numberToWords(100) == "One Hundred"