Re: [Tutor] can i pass a list to a function and get one back ?
way cool, thanks. I am always looking for ways to clean things up-skOn 10/21/06, Danny Yoo [EMAIL PROTECTED] wrote: great, thanks,i have idle right here, would have been just as easy. sorry about thatNo problem; it's cool. hey there, i was just wondering if i could get a list back from a function. something like def return_a_list(some_var): some_list = [] for i in range(5): var = some_var + i some_list.append(var) return some_list is this cool ? It's cool.*grin*One small comment: we often don't need to use temporary variables like'var'.def return_a_list(some_var):some_list = []for i in range(5):some_list.append(some_var + i) return some_listSometimes a temporary variable is useful, and sometimes not.Here, itseems like it's not too necessary.Good luck! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] 5 questions
1. Is there a searchable archive of this list? 2. Is there list ettiquette one should be aware of? 3. Besides Vaults of Parnassus, are there other webpages which list projects written in Python? I'm mainly interested in looking at non-technical software, things for the common user to use. I've been surprised at just how little of that type I've found so far. 4. Can anyone recommend good books for non-programmers starting out learning Python? I've looked through a few so far and they are ok (Learning Python, Python: How to Program) but am still hoping to find one that doesn't assume any prior knowledge of programming and defines terms when they are first presented. (That might be a tall order, I know...) 5. If I want to take user information from text boxes, check boxes, etc., and store it for later re-display to the person (imagine a movie rating diary, with text review of the film and checkboxes or sliders to give it 5 stars, or has action, or is a comedy, etc.) and have all of it be efficiently searchable, what are some good ways to go in terms of how to save the information? For now I have textbox info saving just to a .txt file, but that can't be a good way to go about it. I have the vague sense I should learn about databases, but really am not sure what to read about... Suggestions? _ All-in-one security and maintenance for your PC. Get a free 90-day trial! http://clk.atdmt.com/MSN/go/msnnkwlo005002msn/direct/01/?href=http://www.windowsonecare.com/?sc_cid=msn_hotmail ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] 5 questions
1. Is there a searchable archive of this list? Yes, the ActiveState archive is searchable. The gmane version might be too? 2. Is there list ettiquette one should be aware of? Yes, but I'm not sure how you get a copy. Moderators??? 3. Besides Vaults of Parnassus, are there other webpages which list projects written in Python? I'm mainly interested in looking at non-technical software, things for the common user to use. I've been surprised at just how little of that type I've found so far. Thee are a few such sites around. The Vaults seem to be falling into obsolesece now, although its still my first choice. Others will give you their favourites I'm sure. 4. Can anyone recommend good books for non-programmers starting out learning Python? I've looked through a few so far and they are ok (Learning Python, Python: How to Program) but am still hoping to find one that doesn't assume any prior knowledge of programming and defines terms when they are first presented. (That might be a tall order, I know...) Well, my book assumes zero knowledge and tries to define all terms as they arise. The book is quite old in Python terms but because it is a basics book only it still works quite well, the only significant drop off is that it uses the old string module rather than the newer string methods. Ivan Lanningham's Teah Yourself Python... is also targetted at complete beginners but also is focussed on version 1.5.1 with the same failings. I believe there are a couple of newer books around for beginners too, but I confess I havemn't kept up to date on that front. There are so many Python books available now we are spoilt for choice. That having been said I personally tend to recommend sticking with web based tutorials in the beginning since novice books become irrelevant fairly quickly. The web sites tend to be updated more often than books too. My book uses Python 1.5.1, but the web tutor is for Python 2.3 5. If I want to take user information from text boxes, check boxes, etc., and store it for later re-display to the person (imagine a movie rating diary, with text review of the film and checkboxes or sliders to give it 5 stars, or has action, or is a comedy, etc.) and have all of it be efficiently searchable, what are some good ways to go in terms of how to save the information? For now I have textbox info saving just to a .txt file, but that can't be a good way to go about it. I have the vague sense I should learn about databases, but really am not sure what to read about... Yes databases are a good searchable storage facility. There is a database topic in my web tuitorial that should be enough to get you started. -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] can i pass a list to a function and get one back ?
Danny Yoo wrote: One small comment: we often don't need to use temporary variables like 'var'. def return_a_list(some_var): some_list = [] for i in range(5): some_list.append(some_var + i) return some_list Sometimes a temporary variable is useful, and sometimes not. Here, it seems like it's not too necessary. some_list is not too necessary either; this is a good place for a list comprehension: def return_a_list(some_var): return [ some_var + i for i in range(5) ] or for that matter return range(some_var:some_var+5) Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Exception and sys.exit() in a cgi script
On 10/21/06, Paulino [EMAIL PROTECTED] wrote: Mike Hansen Mike.Hansen at atmel.com Mon Oct 16 18:43:29 CEST 2006 This is a peace of a CGI script i have. 1 import cgi 2 form=cgi.FieldStorage() 3 try : 4 ano=form[ano].value 5 conta=form[conta].value 6 except KeyError : 7 print 'htmlbrbrbodypPlease enter values in the fields/p/body/html ' 8 sys.exit(0) When the excption occurs, no message is shown on the browser. If I run the script with IDLE, the message is printed and then the script exits. What's wrong here?___ Tutor maillist - Tutor at python.org http://mail.python.org/mailman/listinfo/tutor I'm catching up on the weekend's tutor messages.import cgitb; cgitb.enable()That spits errors to the web page which is great for debugging cgiscripts.I think you needprint Content-Type: text/html\n\n http://docs.python.org/lib/cgi-intro.html http://docs.python.org/lib/node560.html Mike Thats not the point (sorry). when all the values are provided in the form (no excetion is raised) it runs as expected! The point is when one of the values ano, conta is missing in the form, I want the error message to be shown on the browser, and the script to stop running. When there is an exception, the script actually stops running, but no message is sent to the browser.Actually, this is the point. The first lines of output from your CGI script, even on an error, needs to be header information to the web server and to the web browser, then a blank line, and then the content to be displayed (text, html, image, etc.). If you don't include the print 'Content-type: text/html\n' line that Mike suggests, then your HTML will be swallowed by the system as configuration information (and erroneous information at that). Mike suggested some webpages to review. It might be good to pour over them to learn more about the CGI protocols. -Arcege-- There's so many different worlds,So many different suns. And we have just one world,But we live in different ones. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Has anyone tried matplotlib...??
I just used it a couple of weeks ago to produce a histogram of randomly generated numbers. Read the documentation, it's well written and has good examples. Matt On 10/22/06, Asrarahmed Kadri [EMAIL PROTECTED] wrote: Folks, Has anyone tried matplotlib ..//??? If yes, then is it easy to use... -- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- Matt ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] rabbit core microcontrollers - Django
Hello, I would wonder if anyone knows something about programming Rabbit Core Modules, that normally were programmed diretctly with Dynamic C, with Python. I mean either: - something like using python to create code in dynamic suitable for the rabbit core - writing machine code for the rabbit core using a python API. Sorry if I'm not using the rights technicals words. Picio ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] getopt module..
Can somebody explain getopt function using a simple example.. Thanks.. Regards, Asrarahmed Kadri-- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] getopt module..
* Asrarahmed Kadri [EMAIL PROTECTED] [2006-10-22 20:19]: Can somebody explain getopt function using a simple example.. Thanks.. This really does have a good example of usage http://docs.python.org/lib/module-getopt.html Essentially, you define options and arguments and what you expect to see from them, then the for o, a in opts: section is used to replace default values with information from the commandline. -- David Rock [EMAIL PROTECTED] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] 5 questions
Alan Gauld wrote: Pine Marten wrote: 2. Is there list ettiquette one should be aware of? Yes, but I'm not sure how you get a copy. Moderators??? Hmm, I didn't get that as part of my new moderator's welcome package. We are pretty informal. The only real rule I can think of is, don't ask us to do your homework, and if someone does ask for a homework solution, don't give it. We will *help* with homework if you make an attempt and ask for help. The best way to ask a question is to make your best attempt at a solution and show it. Then we can see where you are stuck. If you get an exception traceback from your program, include the entire traceback in your post. 3. Besides Vaults of Parnassus, are there other webpages which list projects written in Python? I'm mainly interested in looking at non-technical software, things for the common user to use. I've been surprised at just how little of that type I've found so far. Thee are a few such sites around. The Vaults seem to be falling into obsolesece now, although its still my first choice. Others will give you their favourites I'm sure. The Python Package Index AKA the Cheese Shop is the current repository of choice: http://www.python.org/pypi If there is something specific you are looking for you could ask here or google for python plus the specific topic. 4. Can anyone recommend good books for non-programmers starting out learning Python? I've looked through a few so far and they are ok (Learning Python, Python: How to Program) but am still hoping to find one that doesn't assume any prior knowledge of programming and defines terms when they are first presented. (That might be a tall order, I know...) Try these two: http://personalpages.tds.net/~kent37/BookList.html#learning-python ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Has anyone tried matplotlib...??
Folks, Has anyone tried matplotlib ..//??? If yes, then is it easy to use... -- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Has anyone tried matplotlib...??
On Sun, Oct 22, 2006, Matt Richardson wrote: I just used it a couple of weeks ago to produce a histogram of randomly generated numbers. Read the documentation, it's well written and has good examples. You might also want to look at gnuplot. Bill -- INTERNET: [EMAIL PROTECTED] Bill Campbell; Celestial Software LLC URL: http://www.celestial.com/ PO Box 820; 6641 E. Mercer Way FAX:(206) 232-9186 Mercer Island, WA 98040-0820; (206) 236-1676 ``If guns are outlawed, only the government will have guns. Only the police, the secret police, the military, the hired servants of our rulers. Only the government -- and a few outlaws. I intend to be among the outlaws.'' EDWARD ABBEY (1927-1989) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] My first real python project: LOLLERSKATES
Tracy R Reed wrote: Questions/problems/TODO's: This is a fairly simple structured programming implementation. No OO. Should I be using some classes somewhere? There doesn't seem to be any need for it. The config file is just a module which I import which causes all of my configs to become globals. Globals are bad. Is there a better way or would just about anything else be overkill? A singleton config class or something? Overkill? Instead of from lollerskates_config import * try import lollerskates_config as config or some other abbreviated name. Then instead of using e.g. 'macros' in your program use 'config.macros'. This has the advantage that it is clear where macros is defined and the config variables are not global to your module. IMO singletons are greatly overused in general; in Python a module is a unique namespace. I have several loops in this code for processing the logfiles. I once tried to convert these for loops to list comprehensions and totally confused myself and backed out the change (yeay svn!). Is there any benefit to list comprehensions in this case? I don't see any loops that lend themselves to list comprehensions. A list comp is a shorthand way to build a new list from an existing list. You don't do that. I would kinda like to play with unit tests. Not sure how I would construct unit tests for this. And again, perhaps overkill. But some people tell me you should write the unit tests before you even begin coding and code until the tests are satisfied. So even on a small project you would have tests. I run into a couple nasty bugs I created which caused the script to never return anything from the logfile (so you don't immediately realize something is broken) where I thought It sure would be nice to have a test to catch that if it ever happens again. Yep. Have you looked at the unit test module? Many of your functions are unit-testable though it will be easier if you write them so they don't rely on external state (i.e. globals) (this is one reason globals are evil). For example replace_tokens() could be tested, it would be easier if macros was a parameter instead of taken from the global state. process_line() would be easier to test if it didn't rely on the global events list, but either took the list as a parameter or returned the line or None and let the caller deal with it. Or maybe you do want a class that can hold the shared state... One more note: if re.match(^$,line): could just be if not line: Overall it looks pretty clean and well-written. Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] 5 questions
Kent Johnson wrote: Alan Gauld wrote: Pine Marten wrote: 2. Is there list ettiquette one should be aware of? Yes, but I'm not sure how you get a copy. Moderators??? Hmm, I didn't get that as part of my new moderator's welcome package. We are pretty informal. The only real rule I can think of is, don't ask us to do your homework, and if someone does ask for a homework solution, don't give it. We will *help* with homework if you make an attempt and ask for help. The best way to ask a question is to make your best attempt at a solution and show it. Then we can see where you are stuck. If you get an exception traceback from your program, include the entire traceback in your post. You should've gotten this e-mail when you registered: Your message for tutor@python.org, the Python programming tutor list, has been received and is being delivered. This automated response is sent to those of you new to the Tutor list, to point out a few resources that can help with answering your own questions, or improve the chances of getting a useful answer from the other subscribers. If your question is something akin to: I've just heard about Python, and it sounds great! Where can I find out more on how to program with Python? or: What's Python? please read section 1 below. On the other hand, if your question is: I've heard that Python is good for hacking -- I want to know more! or Can you teach me how to break into a computer with Python? please read section 2 at the bottom of this email. Section 1: -- The most comprehensive overview of python.org help resources is at http://www.python.org/Help.html The Python FAQ is available at http://www.python.org/doc/FAQ.html and it has answers to many questions that people ask, possibly including your question. Another wealth of information and experience can be found via the python.org searches, at http://www.python.org/search/ There you'll find comprehensive, easy-to-use searches over the python.org web site and the Python newsgroup, comp.lang.python. Python has an online tutorial, available freely from http://www.python.org/doc/current/tut/tut.html Finally, when you do send email to the Tutor list, be as clear as you can about the problem, including, when relevant, details like: - Precise error messages, including complete tracebacks - The hardware platform (available in the Python sys module as sys.platform) - The python version (sys.version) - The python search path (sys.path) In general, be specific about what was going on connected with the problem or what specific concept you're having difficulties with. The better the info you provide, the more likely the helpers will be able to glean the answer... There's a HOWTO that shows how to ask smart questions to technical folks: http://catb.org/~esr/faqs/smart-questions.html Although it is provocative, it does have some good points, and is an interesting read. Note that no one is paid to read the tutor list or provide answers, and most readers often have other work that demands their attention. Well-posed requests for help are usually answered fairly promptly, but occasionally a request slips by, so if you do not get a response with one or two working days (it's usually quicker than that), please feel free to send a followup, asking whether anyone is working on your question. Anyway, your message is being delivered to the Tutor list as this one is being sent. However, if your question was about as detailed as Teach me how to program in Python, do not count on an answer -- this email contains all the information you need to start. Come back with a more precise question, and we'll be glad to help. Thanks! Section 2: -- We periodically get requests which ask about hacking or cracking or breaking into computers. If you haven't yet, go read Eric Raymond's article How To Become a Hacker at http://catb.org/esr/faqs/hacker-howto.html If, after you've read that, you want help learning how to hack the way Eric defines the word, then come back to us (and read Section 1 above). If you want help learning how to crack, go look elsewhere -- we're not interested in helping you do that. That about sums it up for me :) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] GUI new project
As a new guy, I was trying to write a simple unit conversion program in Tk. I got this error message:TclError: unknown option -command Traceback (most recent call last): File D:\Python24\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py, line 310, in RunScript exec codeObject in __main__.__dict__ File D:\Python24\Convert it\Tk Grid demo2py.py, line 70, in ? main() File D:\Python24\Convert it\Tk Grid demo2py.py, line 67, in main Application().mainloop() File D:\Python24\Convert it\Tk Grid demo2py.py, line 22, in __init__ , relief=SUNKEN) File D:\Python24\lib\lib-tk\Tkinter.py, line 2409, in __init__ Widget.__init__(self, master, 'listbox', cnf, kw) File D:\Python24\lib\lib-tk\Tkinter.py, line 1862, in __init__ self.tk.call( TclError: unknown option -command Any Ideas? Joe Cox 513-293-4830 from Tkinter import * class Application( Frame ): def __init__(self): Frame.__init__(self) self.master.title( Conver Units ) self.master.rowconfigure( 0, weight = 1 ) self.master.columnconfigure( 0, weight = 1 ) self.grid( sticky = W+E+N+S ) Create the Text self.lbRSSSiteText = Label(self, text=Convert Length Units From:) self.lbRSSSiteText.grid(row=0, column=0, sticky=W) self.lbRSSItemText = Label(self, text=Convert Length Units To:) self.lbRSSItemText.grid(row=0, column=2, sticky=W) Create the First ListBox scrollbarV = Scrollbar(self, orient=VERTICAL) self.lbSites = Listbox(self,command=self.reveal, exportselection=0 , relief=SUNKEN) self.lbSites.grid(row=1, column=0, columnspan=1, sticky=N+W+S+E) for line in ['Miles','Yards','Feet','Inches']: self.lbSites.insert(END, line) Create the Second ListBox self.lbRSSItems = Listbox(self, exportselection=0 ,command=self.reveal , relief=SUNKEN) self.lbRSSItems.grid(row=1, column=2, sticky=N+W+S+E) for line in ['Miles','Yards','Feet','Inches']: self.lbRSSItems.insert(END, line) self.button1 = Button( self, text = Convert, width = 25 ) self.button1.grid( row = 7, column = 1, columnspan = 2, sticky = W+E+N+S ) Create the Text self.entry = Label(self, text=Input:) self.entry.grid(row=8, column=0, sticky=W) self.text2 = Label(self, text=Output:) self.text2.grid(row=8, column=2, sticky=W) self.entry = Entry( self ) self.entry.grid( row = 11, columnspan = 2, sticky = W+E+N+S ) self.text2 = Text( self, width = 2, height = 2 ) self.text2.grid( row = 11, column = 2, sticky = W+E+N+S ) def reveal(self): a = self.entry.get() b = self.text2.get() c = self.lbSites.get(exportselection) d = self.lbRSSItems.get(exportselection) if c == Miles and d == Feet: message =Equals+ a*5280 self.text2.insert(0.0,message) def main(): Application().mainloop() if __name__ == __main__: main() ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] GUI new project
Create the Second ListBox self.lbRSSItems = Listbox(self, exportselection=0 ,command=self.reveal , relief=SUNKEN) Because whitespace is important in python, you can't arbitrarily put newlines into your text. Your program is getting confused because it doesn't know what ', relief=SUNKEN)' means. Try putting a '\' before your newlines. Like: x = \ 'a' HTH, -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] GUI new project
Joe Cox wrote: As a new guy, I was trying to write a simple unit conversion program in Tk. I got this error message:TclError: unknown option -command Traceback (most recent call last): File D:\Python24\Lib\site-packages\pythonwin\pywin\framework\scriptutils.py, line 310, in RunScript exec codeObject in __main__.__dict__ File D:\Python24\Convert it\Tk Grid demo2py.py, line 70, in ? main() File D:\Python24\Convert it\Tk Grid demo2py.py, line 67, in main Application().mainloop() File D:\Python24\Convert it\Tk Grid demo2py.py, line 22, in __init__ , relief=SUNKEN) File D:\Python24\lib\lib-tk\Tkinter.py, line 2409, in __init__ Widget.__init__(self, master, 'listbox', cnf, kw) File D:\Python24\lib\lib-tk\Tkinter.py, line 1862, in __init__ self.tk.call( TclError: unknown option -command Any Ideas? self.lbSites = Listbox(self,command=self.reveal, exportselection=0 , relief=SUNKEN) Acually I think it was this line that was causing trouble first :) Same reason, though. Cheers, -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] GUI new project
Joe Cox [EMAIL PROTECTED] wrote As a new guy, I was trying to write a simple unit conversion program in Tk. I got this error message:TclError: unknown option -command Which says that you are using an unknown option command... ie. Listboxes don't have a command option. HTH, -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] GUI new project
On Sunday 22 October 2006 20:03, Luke Paireepinart wrote: Create the Second ListBox self.lbRSSItems = Listbox(self, exportselection=0 ,command=self.reveal , relief=SUNKEN) Because whitespace is important in python, you can't arbitrarily put newlines into your text. Your program is getting confused because it doesn't know what ', relief=SUNKEN)' means. Try putting a '\' before your newlines. Like: x = \ 'a' HTH, -Luke I'm not an expert Luke but I thought a statement can take more than one line when enclosed in parentheses, square brackets or braces (also when triple quoted). Is this correct John ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] GUI new project
johnf wrote: On Sunday 22 October 2006 20:03, Luke Paireepinart wrote: Create the Second ListBox self.lbRSSItems = Listbox(self, exportselection=0 ,command=self.reveal , relief=SUNKEN) Because whitespace is important in python, you can't arbitrarily put newlines into your text. Your program is getting confused because it doesn't know what ', relief=SUNKEN)' means. Try putting a '\' before your newlines. Like: x = \ 'a' HTH, -Luke I'm not an expert Luke but I thought a statement can take more than one line when enclosed in parentheses, square brackets or braces (also when triple quoted). Is this correct Yep, yep. I confess, I didn't look too closely at that, and I guess I heard one should use backslashes whenever a command goes to a new line, and I assumed it was always true, and never tried without them! You're right, of course, John, and I apologize to the OP. Alan had the correct answer to the problem. Listboxes don't take a command argument. Hope that helps! -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
