I'm having issues with my code for PS2 question 2 it saying that there's an error on my else statement.

- anonymous

- katieb

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- anonymous

balance=4213
annualInterestRate=.2
factor=0
#How much paid total
x=0
#Lowest payment variable
y=0
#Range for one year of paying minimum 12 months in a year
while balance >= 0:
factor+=1
for n in range(1,13):
x=str(factor)*(10*str(n))
balance=(balance-(10*str(factor)))*(1+(annualInterestRate/12)
else:
y=str(factor)*10
#Print Lowest Payment
print('Lowest Payment: '+str(round(y,-1)))

- anonymous

You're getting an "invalid syntax" error?

- anonymous

yes would like to know whats the reason before i procede on fixing the rest of the code

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## More answers

- anonymous

Looks like you're missing a parenthesis on this line:
balance=(balance-(10*str(factor)))*(1+(annualInterestRate/12)

- anonymous

That looks to be the first problem, it's expecting a ")" to close (1+(annualInterestRate/12)

- anonymous

On this line: " x=str(factor)*(10*str(n)) "
You are trying to obtain a number, correct? the "str(x)" method converts the argument into a string.

- anonymous

Yeah, close the parenthesis, then run the code. You should encounter another error...

- anonymous

Always the small things that gets me, thanks. Also for that section of code I am aiming at getting a number value is str() not the function?
Another issue i seem to see is that shouldn't i have a void loop on the calculation of balance part because if the first time the payment isn't right and i go to check the next factor of 10 the balance will be altered do to previous run.

- anonymous

Yea got the TypeError: can't multiply sequence by non-int of type 'str'
Will change that part and others like that asap.

- anonymous

Yeah, you're working with numbers. Checkout here: http://docs.python.org/library/string.html

- anonymous

There you can see methods/functions for string in python. str(x) converts the argument x to a string

- anonymous

How's it going?

- anonymous

For str() i would need to convert to int because the error it shows now is
TypeError: can't multiply sequence by non-int of type 'str'
since working in which month and factors of ten i can change that into int() right?

- anonymous

yeah, basically you can't multiply strings together...

- anonymous

factor is already a number luckily

- anonymous

You shouldn't need to have anything as a string to begin with. I think you are making it more complicated than it is. just leave everything as numbers. you don't even have to convert to str to print it.

- anonymous

I deleted all str() and still have an error at where i have my "else:" statement error is invalid syntax

- anonymous

hm, did you put in that parenthesis at the end?

- anonymous

You are trying to do a while ... else .... there is no such thing, just while or if..else

- anonymous

Can you direct to me the assignment via link?

- anonymous

But, @msmithhnova is right, your current solution may be more complicated than necessary and hence combining programing designs.
if : .. else: clauses exists in python. a while: ... else: block does not exist.

- anonymous

you have to be logged in to view assignment i can send the summary of it though
I change my "while" to "if" and still has same error at same location im double checking all my parenthesis

- anonymous

Paste your current code here please, that'll help

- anonymous

balance=4213
annualInterestRate=.2
factor=0
#How much paid total
x=0
#Lowest payment variable
y=0
if balance > 0:
factor+=1
#Range for one year of paying minimum 12 months in a year
for n in range(1,13):
x=factor*(10*n)
balance=(balance-(10*factor)*(1+(annualInterestRate/12))
else:
y=factor*10
#Print Lowest Payment
print('Lowest Payment: '+str(round(y,-1)))

- anonymous

cool

- anonymous

Yep, missing a parenthesis: balance=(balance-(10*factor)*(1+(annualInterestRate/12)) <---- ) need

- anonymous

Here's some pseudocode that might help
set payment guess
loop
check guess
if guess not right increase guess
end loop

- anonymous

Yupp that did the trick thank you dpflan :) now time to fix the algebra part
msmithhnova will that pseudo code fix the issue with balance being overwritten to a new value when increasing the guess.

- anonymous

No, you will want to create a new variable equal to balance to either work with or keep track of original amoiunt.

- anonymous

Another note is from the pseudocode you are looking at one while loop with everything in it. The only thing that would end up outside the loop is the print statement with your final answer.

- anonymous

An issue with your code above also is that your guess (x) should be changed outside the for as the for loop is the 'check' part of the pseudocode

- anonymous

Try to state the goal of the problem, from there, write out your solution in pseudocode, and create the mathematical relationship among variables

- anonymous

BTW, dpflan, the basics of the problem is make guesses in increments of 10 that it will take to pay off balance in 1 year including interest. Once a guess makes the balance less than 0 you're done.

- anonymous

Never thought about doing a pseudo code seems like an easier cleaner route ill try that and let you know what other issues i run into. Thanks for the all the help so far.

- anonymous

The goal is to find the factor such that the balance becomes 0 within 12 iterations

- anonymous

You need to start each examination with balance at the starting balance.

- anonymous

A simple debugging technique is add print statements in your code, for instance it might help to print the values you are working with, like the balance and the factor

- anonymous

that makes life so much easier thank you i seem to getting some numbers displayed printed out hopefully they are the right numbers.

- anonymous

If not lets us know. Pseudocode is a wonderful thing it allows you to think about the logic and coding seperately instead of doing both at the same time. Once you think you have your logic (pseudocode) figured out then it is just a matter of turning that into actual code. When you do, you sometimes realize your logic (pseudocode) was a little off of your translation to code was and one or both have to be modified. This is where the print statements help immensely to show you where the flaw is.

- anonymous

Yeah, feel free to share your solution when reach one. We can check out your code like we've just done and give you some help. What course is this from? An MIT OCW course, the MOOC course,...?

- anonymous

Edx MIT 600 course

- anonymous

so far this is what i have in my code, added a few things to make up for the override
my answer is 140 but i should be getting 310 with the current balance and interest rate i put in
i will need to look more into pseudo code is there any site that teaches the concept well?

- anonymous

one thing that helped answer is i deleted "-x" in my while statement but im still $30 off

- anonymous

balance=3329
annualInterestRate=.2
factor=0
#How much paid total
x=0
#Lowest payment variable
y=0
balance1=balance
while balance1 >= 0:
factor+=1
x=0
balance1=balance
#Range for one year of paying minimum 12 months in a year
for n in range(1,13):
print('What Factor im on:'+str(factor))
print('Which month im on:'+str(n))
x=factor*10*n
print(str(x))
balance1=(balance1-(10*factor)*(1+(annualInterestRate/12)))
print('Balance so far:'+str(balance1))
amiclose=balance1-x
#print(str(amiclose))
y=factor*10
#Print Lowest Payment
print('Lowest Payment:'+str(y))
#actual Lowest payment should be 310

- anonymous

Just headed home, will take a look when I get there if someone else hasn't by then.

- TuringTest

you have a lot of extra variables...

- anonymous

in my new code i use those variables to check where im at and print out values if you d like i can update the code i noted what each variable does

- TuringTest

x=factor*10*n
this line is strange, why should the minimum payment be proportional to which number month of the year you are in?

- anonymous

that line states how much have i paid off the debt in which factor and this given month so i could check my math

- anonymous

aleluja i was missing a ')' and since it was following mathematical rules PEMDAS it didnt work out at first now everything seems good :) thanks all for the help

- TuringTest

ok, still, n is the number month you are in
this code is saying that you pay factor*10*2 in february, and factor810*3 in march
i.e. you pay more in march then february, how does that make sense?

- anonymous

the thing is how much total have i paid up to that month you know

- TuringTest

it makes sense that the total you have paid my march is more than in february, but you code says that you pay more for *that* particular month than the one before

- TuringTest

I mean, if you get the right answer then okay, but I don't see how...

- anonymous

hmmm im not understanding your question their
but i did submit my code and it was right thanks guys :)

- TuringTest

okey dokey then :)

- anonymous

Glad you got it to work.

- anonymous

What is wrong with this code:
balance = 4213
annualInterestRate = 0.2
monthlyPaymentRate = 0.4
month = 1
balance = (balance - (balance*monthlyPaymentRate))*(1+(annualInterestRate/12))
while month < 13:
print "Month: " + str(month)
print "Minimum monthly payment: " + str(round(minimum_payment_rate, 2))
print "Remaining balance: " + str(round(balance, 2))
month += 1

- anonymous

where do you calculate your balance in the loop?
It will remain the same. You just incrementing the month and you don't touch the min payment or the balance!

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