On 04/10/18 09:31, Alister via Python-list wrote: > On Wed, 03 Oct 2018 09:43:07 -0700, Musatov wrote: > >> On Wednesday, October 3, 2018 at 11:12:43 AM UTC-5, Michael Torrie >> wrote: >>> On 10/03/2018 09:26 AM, Musatov wrote: >>>> I don't even know where to begin! (I'm reading the Dummies book) >>> >>> If you have no experience in computer programming, it's going to be a >>> steep learning curve. >>> >>> But your first step is to learn Python and how to write programs in it. >>> That book and others will help with that. You'll have to write lots of >>> simple programs unrelated to primes along the way that help you >>> understand programming concepts. >>> >>> If you already have experience in other languages, the task will be >>> easier. >>> >>> Computer programming is quite natural to some (small children seem to >>> get it much easier than us adults), but I've seen others struggle to >>> grasp the abstract concepts for years. >>> >>> Once you've grasped basic Python programming, you can return top the >>> original problem at hand. Start by identifying the process or >>> algorithm that would find these primes. In other words, how would you >>> do it on pen and paper? Computer programs are not magic. They are >>> only expressions of human thinking. Often some very smart >>> mathematicians have come up with powerful algorithms (a step-by-step >>> process) to do these things, >>> and your job as a programmer is to turn this mathematical process into >>> a computer program using things like loops and Boolean logic. How would >>> you find these primes using your pen, paper, and calculator? >> >> Literally, how I found them was taking a list of primes and checking if >> the calculations with the lesser primes resulted in numbers also further >> along on the list. >> >> Another way I guess would be to do the calculations then check if the >> number is prime. > > That is exactly how you do it with in a program. > > create a loop & check to see if the target number can be divided by each > possible divisor in turn > . > for large numbers this will take a large number of tests (hey that is why > you have the computer do them, it is faster than you & does not get > bored ;-) ) there are numerous tricks for speeding up this process once > you have the basic working. > > start by testing small numbers & then use your real data once you have > something that works > > as a starter a simple loop in python could be as follows > > for x in xrange(10): > print x > > once you have an outline of a program post it back here if things dont > work as expected >
Two lines, two errors! To save the noob a lot of head-scratching, that should be: for x in range(10): If you're running python 3, as you should do for any new project: print( x ) -- Tony van der Hoff | mailto:t...@vanderhoff.org Buckinghamshire, England | -- https://mail.python.org/mailman/listinfo/python-list