Working with decimals

[Larry Hudson]

On 08/23/2014 02:13 PM, Seymore4Head wrote:
> On Sat, 23 Aug 2014 13:47:20 -0400, Seymore4Head
>
> I found this function that I will be saving for later.
> def make_it_money(number):
>      import math
>      return '$' + str(format(math.floor(number * 100) / 100, ',.2f'))
>
> (I still need more practice to find out how it does what it does, but
> I like the end result)

That's total nonsense and overkill!  If you really want to do it with a separate function, using 
old style:

def make_it_money(number):
     return '$%.2f' % number

or using new style:

def make_it_money(number):
     return '${:.2f}'.format(number)

But even these functions are unnecessary.  Use either of these formatting methods directly in 
the print() statement...

>
> So I changed the line in question to:
>   print (repr(count).rjust(3), make_it_money(payment).rjust(13),
> make_it_money(balance).rjust(14))

print('{:3d} ${:<13.2f} ${:<14.2f}'.format(count, payment, balance))

or

print('%3d $%-13.2f $%-14.2f' % (count, payment, balance))

But please, please, PLEASE first go through a real tutorial, and WORK the examples to fix them 
in your mind.  Questions like these will all be covered there.  And you'll learn the language as 
a whole instead of trying to be spoon-fed isolated answers.  It will be well worth your time.

The tutorial on the official Python web site is a good one (of course there are many others)

docs.python.org/3/tutorial/index.html

It does appear that you're using Py3, but in case you're using Py2, change the '3' in that URL 
to '2'.

(Print formatting is in section 7)

      -=- Larry -=-

PS.  Oops, my bad...  I just double checked my suggestions, which left-justified the values, but 
I see you want them right-justified (which keeps the decimal points lined up).  This complicates 
it a bit to keep the dollar-sign butted up against the value, and it makes it necessary to use 
that make_it_money() function I said was unnecessary.  But it's still unnecessary by using a 
little different finagling...  Try either of these versions:

print('{:3d} {:>13s} {:>14s}'.format(count,
         '$' + str(round(payment, 2)), '$' + str(round(balance, 2))))

print('%3d %13s %14s' % (count, '$' + str(round(payment, 2)), '$' + str(round(balance, 2))))