# Help with some python homework...

Scott W Dunning swdunning at cox.net
Sat Feb 1 06:18:34 CET 2014

```Any chance you guys could help with another question I have?  Below is a code to a different problem.  The only thing I don’t understand is why when calculating the 'discounted price’ you have to subtract 1?  Thanks again guys!

price_per_book = 24.95
discount = .40
quantity = 60
discounted_price = (1-discount) * price_per_book
shipping = 3.0 + (60 - 1) * .75
total_price = 60 * discounted_price + shipping
print total_price, 'Total price'

Scott

On Jan 31, 2014, at 8:02 PM, Denis McMahon <denismfmcmahon at gmail.com> wrote:

> On Thu, 30 Jan 2014 21:12:19 -0800, scottwd80 wrote:
>
>> Here is the question that was asked and below that I'll paste the code I
>> have so far.
>
> The following is a reasonably but not highly obfuscated short solution to
> the problem set in python 2.7. With a bit of luck, after each lesson of
> your course, you'll be able to understand a bit more of how it works.
>
> M=60;H=M*60
> def s(h,m,s): return h*H+m*M+s
> def hms(s): return (int(s/H),int((s%H)/M),s%M)
> (a,b,c)=hms(s(6,52,0)+3*s(0,7,12)+2*s(0,8,15))
> print "{:02d}:{:02d}:{:02d}".format(a,b,c)
>
> When you can write a short paragraph describing what each line of the
> program does, you'll be on your way to understanding a few of the
> structures, syntaxes and mechanisms of python.
>
> Or you could show it to your lecturer or a TA and say it was suggested
> that you ask her or him to work through it with you.
>
> --
> Denis McMahon, denismfmcmahon at gmail.com
> --
> https://mail.python.org/mailman/listinfo/python-list

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