[Tutor] number formatting

[Brad Chandler]

Thanks for the answers on the rounding issue. I suspected it had something
to do with floating point numbers but I just wasn't sure what was happening
and why. I was trying to match some numbers produced by another program
which apparently handles numbers differently. I was only off by about $1.50
over about $1.3 billion, so I guess that's close enough.

Right now I'm trying to figure out how to format numbers as currency.  For
example, I want to turn this: 1314403624.57
into this: $1,314,403,624.57

Now I can easily add a $ to the front of the string, but how do I get those
commas in there? I'm currently using '%.2f' % myfloatingpointnumber to
format it to two decimal places, is there another option which adds commas?

Brad