Stephen Thorne wrote:
> On Wed, 22 Dec 2004 10:27:16 +0530, Gurpreet Sachdeva
> <[EMAIL PROTECTED]> wrote:
> > Is there any module available that converts word like 'one', 'two',
> > 'three' to corresponding digits 1, 2, 3??
>
> This seemed like an interesting problem! So I decided to solve it.
>
> I started with
> http://www.python.org/pycon/dc2004/papers/42/ex1-C/ which allowed me
> to create a nice test suite.
> import num2eng
> for i in range(40000):
> e = num2eng.num2eng(i)
> if toNumber(e) != i:
> print e, i, toNumber(e)
>
> once this all important test suite was created I was able to knock up
> the following script. This is tested up to 'ninty nine thousand nine
> hundred and ninty nine'. It won't do 'one hundred thousand', and
isn't
> exceptionally agile. If I were to go any higher than 'one hundred
> thousand' I would probably pull out http://dparser.sf.net/ and write
a
> parser.
>
Parser?
The following appears to work, with appropriate dict entries for
'million', 'billion', etc:
[apologies in advance if @#$% groups-beta.google stuffs the indenting]
[apologies for the dots, which attempt to the defeat the
indent-stuffing]
.def toNumber2(s):
. items = s.replace(',', '').split()
. numbers = [translation.get(item.strip(), -1) for item in items if
item.strip()]
. stack = [0]
. for num in numbers:
. if num == -1:
. raise ValueError("Invalid string '%s'" % (s,))
. if num >= 100:
. stack[-1] *= num
. if num >= 1000:
. stack.append(0)
. else:
. stack[-1] += num
. return sum(stack)
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