printing float as formatted dollars

[Tim]

"Peter Hansen" <peter at engcorp.com> wrote in message
news:V72dncRoWf6o7gbdRVn-gw at powergate.ca...
> Tim wrote:
>
> > "Larry Bates" <lbates at swamisoft.com> wrote in message
> > news:YtqdnZOyj_KSfArdRVn_iw at comcast.com...
> >
> >>Here is a function I wrote and use.  Note: floats
> >>have rounding "issues" when they get very large.
> [snip long code]
> >>
> > Thanks for the code!, it was a big help.  I had started trying to piece
> > together some logic (below), but I know there are holes in it (negative
> > numbers, for one).
> [snip also long code]
>
> I still find this one much easier to swallow (from the
> aforementioned other thread).
>
>  >>> import re
>  >>> s = 1234567.89
>  >>> '$' + re.sub(r'(?<=\d)(?=(\d\d\d)+(\.|$))', ',', str(s))
> '$1,234,567.89'
>
> -Peter

I agree.  This is a very concise solution.  Since I'm new to both Python and
regular expressions, it took some follow-up reading to understand how/why
this works.  So, I guess in addition to a solution you could say that it
also led me to a basic understanding of regular expressions which seems well
worth having (and which I otherwise probably would have regretfully
continued to ignore).

I appreciate your help,
Tim