将用户输入的数字转换为单词

def number_to_words(num):
    if num == 0:
        return "zero"

    ones = ["", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"]
    teens = ["ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
    tens = ["", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"]
    thousands = ["", "thousand", "million", "billion"]

    def helper(num):
        if num < 10:
            return ones[num]
        elif num < 20:
            return teens[num - 10]
        elif num < 100:
            return tens[num // 10] + ("-" + ones[num % 10] if (num % 10 != 0) else "")
        elif num < 1000:
            return ones[num // 100] + " hundred" + (" and " + helper(num % 100) if (num % 100 != 0) else "")
        else:
            for i, unit in enumerate(thousands):
                if num < 1000**(i + 1):
                    break
            return helper(num // 1000**i) + " " + unit + (" " + helper(num % 1000**i) if (num % 1000**i != 0) else "")

    return helper(num)

# 示例使用
print(number_to_words(1234567))  # 输出: one million two hundred thirty-four thousand five hundred sixty-seven