python: converting numbers to words

Question

I\'m trying to write a code that will convert numbers to words, up to 999 trillion. here is my code so far. it works up to 119, but after that things get messy. I can\'t use

Answer 1

This can easily be done recursively:

def as_words(n):
    """Convert an integer n (+ve or -ve) to English words."""
    # lookups
    ones = ['zero', 'one', 'two', 'three', 'four',
            'five', 'six', 'seven', 'eight', 'nine', 
            'ten', 'eleven', 'twelve', 'thirteen', 'fourteen',
            'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen']
    tens = ['zero', 'ten', 'twenty', 'thirty', 'forty',
            'fifty', 'sixty', 'seventy', 'eighty', 'ninety']
    # negative case
    if n < 0:
        return "minus {0}".format(as_words(abs(n)))
    # 1000+
    for order, word in [(10**12, "trillion"), (10**9, "billion"),
                        (10**6, "million"), (10**3, "thousand")]:
        if n >= order:
            return "{0} {1}{2}".format(as_words(n // order), word,
                                       " {0}".format(as_words(n % order))
                                       if n % order else "")
    # 100-999
    if n >= 100:
        if n % 100:
            return "{0} hundred and {1}".format(as_words(n // 100), 
                                                as_words(n % 100))
        else:
            return "{0} hundred".format(as_words(n // 100))
    # 0-99
    if n < 20:
        return ones[n]
    else:
        return "{0}{1}".format(tens[n // 10],
                               "-{0}".format(as_words(n % 10)) 
                               if n % 10 else "")   

Answer 2

I don't want to discourage you, but this problem has already been solved. There is a neat Python module to do this, called num2words

Here is the link to the GitHub repository

And here is the actual script for the English language (it supports multiple languages). There you can get some inspiration to fix your script if still needed.

Answer 3

I wrote this for project euler using lists originally and using python 2 . There may well be bugs I have not tested it too much but it should hopefully help you along

nums = ["", "one", "two", "three", "four",  "five",
    "six", "seven", "eight", "nine "]
teens = ["", "eleven", "twelve", "thirteen",  "fourteen",
    "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"]
tens = ["", "ten", "twenty", "thirty", "forty",
    "fifty", "sixty", "seventy", "eighty", "ninety"]
thousands = ["","thousand", "million",  "billion",  "trillion"]
def num_to_words():
    n= int(input("Enter number to convert: "))
    words = ""
    if n == 0:
        words += "zero"
    else:
        numStr = "%d" % n
        groups = (len(numStr) + 2) // 3
        numStr = numStr.zfill(groups * 3)
        for i in range(0, groups*3, 3):
            h = int(numStr[i])
            t = int(numStr[i+1])
            u = int(numStr[i+2])
            g = groups - (i // 3 + 1)
            if h >= 1:
                words += nums[h]
                words +=  " hundred "
                words+=" "
                if int(numStr) % 100:   # if number  modulo 100 has remainder  add "and" i.e one hundred and ten
                    words+=" and "
            if t > 1:
                words+= tens[t]
                if u >= 1:
                    words+= nums[u]
                    words+=" "
            elif t == 1:
                if u >= 1:
                    words+= teens[(u)]
                else:
                    words+= tens[t]
                    words+=" "
            else:
                if u >= 1:
                    words+= nums[u]
                    words+=" "

            if g >= 1 and (h + t + u) > 0:
                words+= thousands[g]
                words+=" "
    return words
In [7]: num_to_words()
Enter number to convert: 12399990
Out[7]: 'twelvemillion three hundred   and ninetynine  thousand nine  hundred   and ninety'

Answer 4

This worked for me in Python 3.x:

print('Type any number here: ')
number = input()
int_side = number
dec_side = ''
for i in range(0, len(number)):
    if number[i] == '.':
        int_side = number[:i]
        dec_side = number[i + 1:]
        break
while not (int_side.isdigit()) or not (dec_side.isdigit()) and dec_side != '':
    dec_side = ''
    print('Only numbers are allowed! (decimals included, but not fractions)')
    print('Type any number here: ')
    number = input()
    int_side = number
    for i in range(0, len(number)):
        if number[i] == '.':
            int_side = number[:i]
            dec_side = number[i + 1:]
    user_choice = input()
int_length = len(int_side)
ones = ['', 'one ', 'two ', 'three ', 'four ', 'five ', 'six ', 'seven ', 'eight ', 'nine ']
teens = ['ten ', 'eleven ', 'twelve ', 'thirteen ', 'fourteen ', 'fifteen ', 'sixteen ', 'seventeen ', 'eighteen ',
         'nineteen ']
decades = ['', '', 'twenty ', 'thirty ', 'forty ', 'fifty ', 'sixty ', 'seventy ', 'eighty ', 'ninety ']
hundreds = ['', 'one hundred ', 'two hundred ', 'three hundred ', 'four hundred ', 'five hundred ', 'six hundred ',
            'seven hundred ', 'eight hundred ', 'nine hundred ']
comma = ['thousand, ', 'million, ', 'trillion, ', 'quadrillion, ']
word = ''
int_length = len(int_side)
dec_length = len(dec_side)
change = int_length
up_change = 0
while change > 0:
    if int_side == '':
        break
    if number == '0':
        word = 'zero'
        break
    elif change > 1 and int_side[change - 2] == '1':
        for i in range(0, 10):
            if int_side[change - 1] == str(i):
                word = teens[i] + word
    else:
        if change > 0:
            for i in range(0, 10):
                if int_side[change - 1] == str(i):
                    word = ones[i] + word
        if change > 1:
            for i in range(0, 10):
                if int_side[change - 2] == str(i):
                    word = decades[i] + word
    if change > 2:
        for i in range(0, 10):
            if int_side[change - 3] == str(i):
                word = hundreds[i] + word
    if change > 3:
        word = comma[up_change] + word
    change -= 3
    up_change += 1
word += 'point '
for i in range(0, len(dec_side)):
    for x in range(0, 10):
        if dec_side[i] == str(x):
            word += ones[x]
print(word)

This is an example:

Type any number here: 13243214.1324hk
Only numbers are allowed! (decimals included, but not fractions)
Type any number here: 13243214.1324
thirteen million, two hundred forty three thousand, two hundred 
fourteen point one three two four