I not offering a program design answer. I don't have a clue as to your operation, but I've been there as far as QA software, CNC programs and Quality record keeping. My thought is that instead of starting with the casting, think of the BOM on the final ass'y/configuration print and work backwards. Hint, I wish I'd have had Python's Dictionary & Tuple when I was active. -----Original Message----- From: tutor-request <tutor-requ...@python.org> To: tutor <tutor@python.org> Sent: Wed, Jan 26, 2011 6:55 am Subject: Tutor Digest, Vol 83, Issue 115 Send Tutor mailing list submissions to tutor@python.org To subscribe or unsubscribe via the World Wide Web, visit http://mail.python.org/mailman/listinfo/tutor r, via email, send a message with subject or body 'help' to tutor-requ...@python.org You can reach the person managing the list at tutor-ow...@python.org When replying, please edit your Subject line so it is more specific han "Re: Contents of Tutor digest..." oday's Topics: 1. Re: class question (Alan Gauld) 2. Re: Shuts down when asking user for info (Alan Gauld) 3. Re: Shuts down when asking user for info (Alan Gauld) 4. Re: class question (Karim) 5. Re: class question (Karim) 6. Re: class question (Elwin Estle) --------------------------------------------------------------------- Message: 1 ate: Wed, 26 Jan 2011 11:08:07 -0000 rom: "Alan Gauld" <alan.ga...@btinternet.com> o: tutor@python.org ubject: Re: [Tutor] class question essage-ID: <ihovb6$h2n$1...@dough.gmane.org> ontent-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Karim" <karim.liat...@free.fr> wrote > Program towards interface that means you have to use inheritance. Just to be picky, you can program by interface without using nheritance. Inheritance is only needed to implement interfaces n languages like C++. In Python (and other dynamically ound OOP languages) you can use polymorphism without nheritance. -- lan Gauld uthor of the Learn to Program web site ttp://www.alan-g.me.uk/ ----------------------------- Message: 2 ate: Wed, 26 Jan 2011 11:13:59 -0000 rom: "Alan Gauld" <alan.ga...@btinternet.com> o: tutor@python.org ubject: Re: [Tutor] Shuts down when asking user for info essage-ID: <ihovm5$irq$1...@dough.gmane.org> ontent-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Casey Key" <i.eat.brain...@gmail.com> wrote > Please help , run the script and see that once you press enter after entering name it just shuts it down, help. > -------------- rint("\tWelcome to Casey's magical python code!") rint("\tWritten by no other than Casey Key!") rint("\nWe will begin by getting some information,mmmkay?") ame = input("what is your name") rint("your name is",name) ----------------- Python is case sensitive, print starts with a lowercase P. However that should have generated an error. ow did you run the program? If you ran it from an IDE or rom the command prompt you would have seen the error. suspect you are just double clicking in a file manager? oing that the window will close before you can read it. lways test your code by running from a prompt so that ou see all output, including errors. lan Gauld uthor of the Learn To Program website ttp://www.alan-g.me.uk/ ----------------------------- Message: 3 ate: Wed, 26 Jan 2011 11:09:35 -0000 rom: "Alan Gauld" <alan.ga...@btinternet.com> o: tutor@python.org ubject: Re: [Tutor] Shuts down when asking user for info essage-ID: <ihovdt$hgl$1...@dough.gmane.org> ontent-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original tee chwee liong" <tc...@hotmail.com> wrote > maybe you can use raw_input? It looks like the OP is using Python 3 so input() is the correct unction. lan G. ----------------------------- Message: 4 ate: Wed, 26 Jan 2011 12:19:43 +0100 rom: Karim <karim.liat...@free.fr> o: tutor@python.org ubject: Re: [Tutor] class question essage-ID: <4d40034f.4080...@free.fr> ontent-Type: text/plain; charset=ISO-8859-1; format=flowed ure, but I come from java world and 1 inheritance is allowed but we can mplement multiple interfaces. like to use Abstract classes in Python then inherit and implement bstract method like in java (at least hat's all I remember from Java experience). ndeed I was too direct everybody has the same style. Regards arim On 01/26/2011 12:08 PM, Alan Gauld wrote: "Karim" <karim.liat...@free.fr> wrote > Program towards interface that means you have to use inheritance. Just to be picky, you can program by interface without using inheritance. Inheritance is only needed to implement interfaces in languages like C++. In Python (and other dynamically bound OOP languages) you can use polymorphism without inheritance. ------------------------------ Message: 5 ate: Wed, 26 Jan 2011 12:25:19 +0100 rom: Karim <karim.liat...@free.fr> o: Steven D'Aprano <st...@pearwood.info> c: tutor@python.org ubject: Re: [Tutor] class question essage-ID: <4d40049f.5050...@free.fr> ontent-Type: text/plain; charset=ISO-8859-1; format=flowed know the the law of Murphy. ut this one is a must-have.:-) Regards arim > * One way to reduce coupling is with the Law of Demeter: if you want your dog to walk, don't talk to your dog's legs. You will only confuse the dog and it won't get anywhere. http://en.wikipedia.org/wiki/Law_of_Demeter Hope this helps. ------------------------------ Message: 6 ate: Wed, 26 Jan 2011 04:45:18 -0800 (PST) rom: Elwin Estle <chrysalis_reb...@yahoo.com> o: tutor@python.org, Steven D'Aprano <st...@pearwood.info> ubject: Re: [Tutor] class question essage-ID: <229841.16130...@web130204.mail.mud.yahoo.com> ontent-Type: text/plain; charset="iso-8859-1" Elwin Estle wrote: > Is it better to have one large sort of "do it all" class, or break the larger class up into smaller classes? Yes. Or no. It's impossible to answer that question definitively without knowing more about hat "it all" is. But I can give some general advice: * Python isn't Java. Don't feel that you must use classes. If your problem is etter solved using a procedural or functional approach, go right ahead and use t. Classes aren't compulsory. * The standard model which you should use it: ? verbs -> functions or methods nouns -> classes or attributes ? You should be able to answer the question "What *thing* does your class represent?". (The answer can be an abstract thing, but it should be a thing.) ? If you can't answer that question, then you shouldn't use a class. You should solve the problem using stand-alone functions. * Think about "is-a" and "has-a" relationships: ================================================================= The class in question, does, in fact, deal with a thing.? The problem is, the thing" is highly mutable.?? The "is-a" and the "has-a" changes. Here is the scenario: A raw casting comes into a factory.? It is listed as such.? When machined, this art number changes to a different part number.?? The raw casting has no quality related" stuff, but the machined casting does, and it can have more han one "quality related" thing. ...because, the raw casting may go through multiple operations to get to it's inal state.? It may get machined on a lathe, then be transferred to a CNC achining station where a bolt circle may be drilled and tapped into it.? Each f those operations on separate machines will have a different set of quality hecks associated with it. ...or it might be a part that goes from a raw casting to a sort of mini-assembly" such as a rocker lever (if you know what that is), so we have aw casting = one part number, then it gets a bushing pressed into it = another art number, then it gets a threaded insert = another part number, but it is till the same thing, and each one of those steps may have some sort of quality heck involved. Lets complicate things even further.? One raw casting may be machined into ultiple part numbers.? Perhaps the only thing that changes is the location of a ingle hole.? But again, each one of those part numbers may go through multiple achining operations on different machines, with different quality checks.? This s done through something called a "tabbed" blueprint, wherein there is a master umber, but there are "tabs" indicating that if you changes such and such eature, then the part number isn't the master number, but the tabbed number. So, in essence, there's a sort of "network" of "is-a" and "has-a" information. My idea was to, instead of having just a single "part" class, to have a sort of component aggregate" class, which would cover not only single parts, but ssemblies of parts.? So, even if a part was as simple as a raw casting that is ust machined into a finished part and that's it, it would still be treated as a ort of assembly, with the raw casting being a component of the finished part umber, if that makes sense. So there's all this information associated with a given part.? I am thinking it as a sort of tree structure.? I am just wondering if some of the branches of he tree should be separate classes that are then tied into the "trunk" of the aster class, or if the whole thing should be a tree into and of itself. ...and yeah, I know, it's kind of a complex problem for a newbie to be thinking bout. ------------- next part -------------- n HTML attachment was scrubbed... RL: <http://mail.python.org/pipermail/tutor/attachments/20110126/c747b525/attachment.html> ------------------------------ _______________________________________________ utor maillist - Tutor@python.org ttp://mail.python.org/mailman/listinfo/tutor nd of Tutor Digest, Vol 83, Issue 115 *************************************
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