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Re: Working with decimals

References <vrihv9l5sce3bkreceav5uhkaqdo9dqnri@4ax.com>
Date 2014-08-23 14:21 -0400
Subject Re: Working with decimals
From Joel Goldstick <joel.goldstick@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.13346.1408818070.18130.python-list@python.org> (permalink)

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On Sat, Aug 23, 2014 at 1:47 PM, Seymore4Head
<Seymore4Head@hotmail.invalid> wrote:
> I am trying to do this example:
> http://openbookproject.net/pybiblio/practice/wilson/loan.php
> The instructions warn that floating point math can get messy so I
> cheated a little bit to get me going.
>
> I made my program work by using numbers that wouldn't get messy.
> Instead of using 6% interest I used 10 and instead of using 12 months,
> I used 10.
>
> I managed to get it working and formatted just like they wanted it,
> but now I want to try to use any numbers.  It has been hard to figure
> out which method to use.
>
You need to learn about string formatting.  Here is a good link:
http://mkaz.com/2012/10/10/python-string-format/

> Here is the working program.
>
> import sys
> count = 0
> payment = 0
> borrowed = 100
> rate = 10
> term = 10
> interest=borrowed*rate*.01     #(*1)
> balance = borrowed + interest
> print ("Loan calculator")
> print ("")
> print ("Amount borrowed: ", borrowed)
> print ("Interest rate: ", rate)
> print ("Term: (months)", term)
> print ("")
> print ("Amount borrowed:" , borrowed)
> print ("Total interest paid:" , interest)
> print ("")
> print ("")
> print ("            Amount      Remaining")
> print ("Pymt#        Paid        Balance")
> print ("-----       ------       ----------")
> while count <=term:
>
>
>     print (repr(count).rjust(3), repr(payment).rjust(13),
> repr(balance).rjust(14))
>
>
I don't understand why you are using repr(..)  It is not necessary.

>     payment = (borrowed + interest)/term
>     balance = balance - payment
>     count = count + 1
>
> What should I use to make the formatting come out correctly when the
> program prints "payment" and "balance" using decimal format?
>
> If you change the "rate" from 10 to 6 and the "term" from 10 to 12,
> the screen gets very messy.
>
> Anyone care to suggest what method to use to fix the decimal format?
> --
> https://mail.python.org/mailman/listinfo/python-list



-- 
Joel Goldstick
http://joelgoldstick.com

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Thread

Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 13:47 -0400
  Re: Working with decimals Joel Goldstick <joel.goldstick@gmail.com> - 2014-08-23 14:21 -0400
    Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 15:07 -0400
      Re: Working with decimals Joel Goldstick <joel.goldstick@gmail.com> - 2014-08-23 15:22 -0400
      Re: Working with decimals Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-23 20:24 +0100
        Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 15:48 -0400
          Re: Working with decimals Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-08-23 21:31 +0100
  Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 17:13 -0400
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-23 22:47 +0100
    Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-24 08:31 +1000
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-23 23:47 +0100
    Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-24 08:53 +1000
    Re: Working with decimals Larry Hudson <orgnut@yahoo.com> - 2014-08-24 00:04 -0700
      Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-24 10:58 -0400
      Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-24 11:12 -0400
        Re: Working with decimals Larry Hudson <orgnut@yahoo.com> - 2014-08-24 14:24 -0700
          Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-24 19:07 -0400
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:12 +0100
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:17 -0600
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:19 -0600
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:25 +0100
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:29 +0100
      Re: Working with decimals Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-25 12:16 +1000
        Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-25 12:27 +1000
          Re: Working with decimals Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-25 12:51 +1000
            Re: Working with decimals Chris Angelico <rosuav@gmail.com> - 2014-08-25 13:01 +1000
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:37 -0600
    Re: Working with decimals Ian Kelly <ian.g.kelly@gmail.com> - 2014-08-24 13:40 -0600
    Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-24 20:49 +0100
  Re: Working with decimals Joshua Landau <joshua@landau.ws> - 2014-08-23 22:52 +0100
    Re: Working with decimals Seymore4Head <Seymore4Head@Hotmail.invalid> - 2014-08-23 18:03 -0400

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