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```import sys, string as str

words = {
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'
}

tens = [
'',
'twenty',
'thirty',
'forty',
'fifty',
'sixty',
'seventy',
'eighty',
'ninety',
]

placeholders = [
'',
'thousand',
'million',
'billion',
'trillion',
]

# segMag = segment magnitude (starting at 1)
def convertTrio(number):
if int(number) < 100:
return convertDuo(number[1:3])
else:
return ' '.join([ words[int(number[0])],  'hundred',  convertDuo(number[1:3]) ])

def convertDuo(number):
#if teens or less
if int(number[0]) <= 1:
return words[int(number)]
#twenty-five
else:
return ''.join([tens[int(number[0]) - 1], '-', words[int(number[1])]])

if __name__ == "__main__":

string = []
numeralSegments = []
numeral = sys.argv[1]

# left-pad number with zeros to make its length a multiple of 3
if len(numeral) % 3 > 0:
numeral = str.zfill( numeral, (3 - (len(numeral) % 3)) + len(numeral) )

# split number into lists, grouped in threes
for i in range (len(numeral), 0, -3):
numeralSegments.append(numeral[i-3:i])

# for every segment, convert to trio word and append thousand, million, etc depending on magnitude
for i in range (len(numeralSegments)):
string.append(convertTrio(numeralSegments[i]) + ' ' + placeholders[i])

# reverse the list of strings before concatenating to commas
string.reverse()
print ', '.join(string)
```

#### Diff to Previous Revision

```--- revision 2 2008-11-30 19:01:26
+++ revision 3 2012-11-28 19:41:07
@@ -1,23 +1,3 @@
-#  Copyright (c) 2008 Karan Bhangui <http://karan.bhangui.com/>
-#
-#  Permission is hereby granted, free of charge, to any person obtaining a copy
-#  of this software and associated documentation files (the "Software"), to deal
-#  in the Software without restriction, including without limitation the rights
-#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-#  copies of the Software, and to permit persons to whom the Software is
-#  furnished to do so, subject to the following conditions:
-#
-#  The above copyright notice and this permission notice shall be included in
-#  all copies or substantial portions of the Software.
-#
-#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-#  THE SOFTWARE.
-
import sys, string as str

words = {
```