[Tutor] home_finance.py

[Ricardo Aráoz]

Eric Walker wrote:
> I think you need to check to see if the remaining amount is less than
> the payment amount.
> 
> Eric...

Or just subtract the minimum between the remaining amount and the
payment amount. See below

> 
> */Christopher Spears <cspears2002 at yahoo.com>/* wrote:
> 
>     I'm working on a problem in Chapter 5 of Core Python
>     Programming(2nd Edition). I am supposed to write a
>     script that take an opening balance and a monthly
>     payment from the user. The script then displays the
>     balance and payments like so:
> 
> 
>     Enter opening balance: 100
>     Enter monthly payment: 16.13
>     Amount Remaining
>     Pymnt# Paid Balance
>     0 0.00 100.00
>     1 16.13 83.87
>     2 16.13 67.74
>     3 16.13 51.61
>     4 16.13 35.48
>     5 16.13 19.35
>     6 16.13 3.22
>     7 3.22 0.00
> 
>     Here is what I have written so far:
> 
>     #!/usr/bin/env python
> 
>     balance = float(raw_input("Enter opening balance: "))
>     payment = float(raw_input("Enter monthly payment: "))
> 
>     print "\tAmount\tRemaining"
>     print "Pymnt#\tPaid\tBalance"
> 
>     payment_num = 0
>     print "%d\t%.2f\t%.2f" % (payment_num,0,balance)
> 
>     while balance >= 0:
>     payment_num = payment_num + 1
>     if balance > 0:

>     balance = balance - payment
Instead of this ^^^ line you should have :
      balance = balance - min(balance, payment)
And I guess that would be it.

>     print "%d\t%.2f\t%.2f" %
>     (payment_num,payment,balance)
>     else:
>     payment = balance
>     balance = balance - payment
>     print "%d\t%.2f\t%.2f" %
>     (payment_num,payment,balance)
> 
>     This is what my script displays:
> 
>     Enter opening balance: 100
>     Enter monthly payment: 16.13
>     Amount Remaining
>     Pymnt# Paid Balance
>     0 0.00 100.00
>     1 16.13 83.87
>     2 16.13 67.74
>     3 16.13 51.61
>     4 16.13 35.48
>     5 16.13 19.35
>     6 16.13 3.22
>     7 16.13 -12.91
> 
>     I'm not sure how to solve this problem. Apparently,
>     trying to catch the remaining balance when it becomes
>     negative doesn't work!
>     _______________________________________________
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