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Hi folks, absolute beginner here trying out problem set 1. I've got the code for obtaining the basic information, and the code for the 4 relevant equations, but I can't figure out how to write the code to get the balance after month 1 to become the starting balance for month 2, etc.... can anybody help me with this?
 one year ago
 one year ago
Hi folks, absolute beginner here trying out problem set 1. I've got the code for obtaining the basic information, and the code for the 4 relevant equations, but I can't figure out how to write the code to get the balance after month 1 to become the starting balance for month 2, etc.... can anybody help me with this?
 one year ago
 one year ago

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rsmith6559Best ResponseYou've already chosen the best response.0
Probably, without seeing any code, just assign the balance after month 1 to whatever variable was the starting balance for month 1 and let it run.
 one year ago

bwCABest ResponseYou've already chosen the best response.0
use a loop, modify the balance variable in the loop, on the next iteration (month) it will be the balance for the next month
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
Thanks for the replies! I thought I tried to create a loop with the following code, but it just gives me the same values I get for Month 1 for months212. Any clue where I go wrong? Code: #Gets initial values for credit variables from user input bal = float(raw_input('Enter the outstanding balance on your credit card: ')) apr = float(raw_input('Enter the annual interest rate as a decimal: ')) mpr = float(raw_input('Enter the minimum monthly payment rate as a decimal: ')) #Basic equations that use input values to return the new balance minpay = mpr*bal intpaid = apr/12 *bal prinpaid = minpay  intpaid newbalance = bal  prinpaid m = 1 for m in range(1,13): print 'Month: ', m print 'Minimum monthly payment: ', minpay print 'Principle paid: ', prinpaid print 'Remaining balance: ', newbalance bal = newbalance
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
That last bit should read, bal = newbalance, flush under the last print command...
 one year ago

bwCABest ResponseYou've already chosen the best response.0
please use a code pasting site:  http://dpaste.com  http://pastebin.com  http://www.repl.it/  http://pastie.org  http://codepad.org  http://ideone.com paste your code there and post the link here. select Python syntax highlighting when u paste.
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
Oh ok, sorry about that!
 one year ago

bwCABest ResponseYou've already chosen the best response.0
in your loop, what kind of statements are you executing? Are there any statements in the loop that modify bal or newbalance?
 one year ago

bwCABest ResponseYou've already chosen the best response.0
when you think about this problem, what happens over and over again each month?
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
all of the equations are calculated each month (save for 2), because they all involve a quantity that is changing from month to monththe balance. But I thought that if I wrote bal = newbalance, the next time it runs the loop for month two, it should give me the write result, since the bal for month 2 will now be factored into the variables I ask it to output, if that makes sense.
 one year ago

bwCABest ResponseYou've already chosen the best response.0
... i don't see any calculations in the for loop, just print statements
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
Ok, so if put the calculations in the loop and THEN put bal=newbalance, that will solve my problem?
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
Thanks for taking the time to reply, btw...
 one year ago

bwCABest ResponseYou've already chosen the best response.0
the calcs need to be in the loop. does mpr change every month or is it constant? "... THEN put bal=newbalance, ... " you could just use bal = bal  prinpaid
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
mpr is constant... yeah, since i just started this stuff yesterday, i keep wanting to create a new variable every time that variable changes... i forget that bal = bal  prinpaid is a possibility
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
Thanks so much for your help... i think I can get it to work with the info you gave me!
 one year ago

ShannonNBest ResponseYou've already chosen the best response.0
If you're still here, how do I get python to show the return values with two and only decimal places (it's a float return)?
 one year ago

bwCABest ResponseYou've already chosen the best response.0
http://docs.python.org/2.7/library/functions.html#round
 one year ago
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