[Tutor] Generic dictionary
[Crossposted to tutor and general mailing list] Hi, I'd like to extend the dictionary class by creating a class that acts like a dictionary if the class is instantiated with a dictionary and acts like a "dictitem" ([(key1, value1), (key2, value2), ...]) if instantiated with a list (that is dictitem). The code (see extract at bottom) works well but it contains a lot of "if this is a dictionary then do as a dictionary already does" boilerplate code". How can I "inherit"(?)/"subclass"(?)/derive from dict so I don't have to write the code for the dictionary case? Thorsten ``` class GenericDict: """ a GenericDict is a dictionary or a list of tuples (when the keys are not hashable) """ def __init__(inst, generic_dict): inst._generic = generic_dict def __getitem__(inst, key): if isinstance(inst._generic, dict): return inst._generic[key] else: return inst.values()[inst.keys().index(key)] def values(inst): if isinstance(inst._generic, dict): return inst._generic.values() else: try: return list(zip(*inst._generic))[1] except IndexError: # empty GenericDict return () def keys(inst): if isinstance(inst._generic, dict): return inst._generic.keys() else: try: return list(zip(*inst._generic))[0] except IndexError: # empty GenericDict return () ``` ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Standardizing on Unicode and utf8
* Dinesh B Vadhia (Fri, 20 Feb 2009 02:52:27 -0800)
We want to standardize on unicode and utf8
Very good idea.
and would like to clarify and verify their use to minimize encode
()/decode()'ing:
1. Python source files
Use the header: # -*- coding: utf8 -*-
Good idea (although only valid for comments and inline strings
2. Reading files
In most cases, we don't know the source encoding of the files being
read. Do we have to decode('utf8') after reading from file?
No. If you don't know the encoding of the file you can't decode it, of
course. You can read() it of course, but you can't process it (as text).
3. Writing files
We will always write to files in utf8. Do we have to encode('utf8')
before writing to file?
Yes, sure.
Is there anything else that we have to consider?
Hm, in general nothing I'm aware of.
Thorsten
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Re: [Tutor] Standardizing on Unicode and utf8
* spir (Fri, 20 Feb 2009 13:02:59 +0100) Le Fri, 20 Feb 2009 02:52:27 -0800, Dinesh B Vadhia dineshbvad...@hotmail.com s'exprima ainsi: We want to standardize on unicode and utf8 and would like to clarify and verify their use to minimize encode()/decode()'ing: 1. Python source files Use the header: # -*- coding: utf8 -*- You don't even need fancy decoration: # coding: utf-8 is enough. Sure? Never heard of that. Interesting... Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Add readline capabilities to a Python build 2.6 on Ubuntu
* Eric Dorsey (Thu, 19 Feb 2009 12:24:07 -0700) Still doesnt work.. I just get this when I hit the up arrow: ^[[A Bah. It works in the 2.5 version that came packaged with it. Thanks for trying :) There's a log for the ./configure. See if the configure script can find readline. Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to make python program as executable
* Luke Paireepinart (Wed, 30 Jan 2008 03:59:59 -0600) I think he meant i want to make the application [into an] executable I.E. he wants an .exe file on Windows. In this case, you can use py2exe, and there's another alternative I can't remember. The better alternative is Pyinstaller... Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Python Versions
* Tiger12506 (Fri, 14 Dec 2007 16:23:00 -0500) Despite what your english teacher might have tried to make you believe, they were wrong about the lack of a neutral in english. Just like ending sentences with prepositions has always been done and always will be done, the use of they to refer to someone of indeterminate gender has been well and alive for hundreds of years. The fact you think it isn't okay is because some english teacher sold you a line of crap about prescriptive grammar rules that don't actually hold true in actual writing. Many grammar books try to make the language into what it is not, rather than describing it as it is. No. I form my own opinions and do not believe individuals such as my english teachers unless I truly believe that each one is correct. Each of my english teachers will not tell you to use they or even the masculine, instead prefering the proper way to be his/her, and equivalent forms. I personally believe this to be a waste of time, and efficiency is one of my primary motivators. Therefore, for space and time I use he for an unknown. That's common English usage: 'In languages with a masculine and feminine gender (and possibly a neuter), the masculine is usually employed by default to refer to persons of unknown gender. This is still done sometimes in English, although an alternative is to use the singular they.'[1] Proper english (as it is from my viewpoint) would be to restructure the sentence so that it uses one in that instance. (My english teachers would gasp at this) This makes the most logical sense. For more than one person of unknown gender, English uses everyone. So for one person of unknown gender, English uses one. No (see above). They does not match plurality. Using they as you describe it would mean that we should be forming sentences such as They works They bakes They codes in python. Clearly this does not sound correct because the word they is meant to be used as a plural pronoun only. No (see above). Thorsten [1] http://en.wikipedia.org/wiki/Grammatical_gender#Indeterminate_gender ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] ipython / readline problem
* Tiago Saboga (Thu, 13 Dec 2007 17:05:55 -0200)
On Thu, Dec 13, 2007 at 07:41:08AM -0500, Kent Johnson wrote:
Tiago Saboga wrote:
type 'exceptions.UnicodeEncodeError': 'ascii' codec can't encode
character u'\xe7' in position 2: ordinal not in range(128)
===
What's happening? Why do the readline methods accept a multibyte
string ('ação') but not a unicode (u'ação')?
I don't know what is happening with readline but this error is usually the
result of converting a Unicode string to a plain string without specifying
encoding, either explicitly by calling str() or implicitly such as in a
print statement:
I already knew that, but it helped somehow ;)
Apparently the problem is that ipython converts the input to unicode,
while the readline module wants a string object. With single line
input, ipython doesn't interfere with readline, but for multiline
input, it updates readline's history, but it tries to to that with the
unicode object. I've sent a patch to the ipython bug to reencode the
string to sys.stdin.encoding before submitting it to readline.
For the new Ipython there's a new setting:
pyreadline.unicode_helper.pyreadline_codepage='utf8'
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[Tutor] Installing modules via setuptools in a script
Hi, can anyone give me a short code snippet how to install a missing module via setuptools (assuming setuptools is already installed)?! Something like this: try: import missing_module except import_error import setuptools setuptools.whatever.install(missing_module) Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] repeated times
* linda.s (Sun, 4 Nov 2007 01:39:46 -0800) On Nov 2, 2007 1:03 AM, ALAN GAULD [EMAIL PROTECTED] wrote: I want to run an .exe file and get the output many times. Given that I know that you know about loops I have to ask what you see as the problem? I want to run it many times and export all the output to a text file. OK, Do you mean you want to run the program multiple times but put the output in the same file? Yes. For example, I want to run the exe file one hundred times and save all the results into one file. Is there any example code to do that? There's no reason to do that in Python. You should use a batch or shell script for that. If you really insist on using Python then look at the subprocess module... Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to Python and Linux
* Armand Nell (Wed, 26 Sep 2007 08:07:12 +0200) I am new to python programming and also the linux enviroment most of my skills are windows based and programming skills is visual basics. I decided that it would be a great start and new direction for me to learn python and at the same time linux. However I have already run into a wall, and any help would be appreciated even if you can direct me where to find the info or 'turor'. [...] In windows, if i write a program in Python and save it I then can simply double click the icon and the program will execute in a console window. Now under Fedoracore I write my program in gedit save it in my \home\(username)\python directory, when I double click it, it opens up agian in gedit. Now true it is maybe a simple error from me but mostly it is me that don't know how to work with python on linux. I would like to know how do I test(run) the programs I write under fedoracore? It's exactly the same as with with Visual Basic (visual basics? Are you sure you have experience in that language?) and Windows: run it in a command window (like python myscript.py) or associate the file type (.py) with the program. How you do that depends on your desktop environment (KDE or Gnome probably) but it shouldn't take you more than ten seconds to find out how to do it. Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] New to Python and Linux
* Thorsten Kampe (Fri, 28 Sep 2007 14:09:24 +0100) It's exactly the same as with with Visual Basic [...] Guess I mixed that up with VBScript... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] executing file properly
* Vivian Tini (Tue, 7 Aug 2007 12:20:29 +0200) The TestCases executable works properly when I run it from the shell prompt. Then I try to run it from the Python command prompt by the following script: import os os.system(home/.../.../.../TestCases) I used ... to type it short. Then it gives the following error output: cannot open Des.in Well in this case tbe os.system command is typed correctly already since this the error message given out is written in the code itself. So the executable run already only when running from Python prompt it cannot open this file. Could anyone suggest me what would be the cause of this problem? You said it yourself: I used ... to type it short. And how should I handle it ? Even simpler: don't use ... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] os.path.exists(path) returns false when the pathactually exists!
* Tiger12506 (Sat, 28 Jul 2007 10:33:36 -0500) So the better question is, does is this file a broken symbolic link or can os.stat() be executed on it? How do I find if it is a broken symbolic link in Windows 2000 ? os.stat(path) returns an OSError saying that there is no such file or directory Wow. I've never heard of this. What are the file's attributes? What does it say about the file when you right-click Properties? Hmmm... what's going on here? Permission not granted to execute os.stat()? Why wouldn't anyone have permission to do that? A broken symbolic link... That means a hard link that has been cut-off right? No, symbolic links and hard links are totally different. (Hard-links are like pointers to files in NTFS) ~ so if the file's been moved, that hard link will point to nothing, being broken, right? Thre are no broken hard links... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Shelve del not reducing file size
* Kent Johnson (Fri, 27 Jul 2007 08:06:33 -0400) Barton David wrote: *sigh* I'm really going off Python. In what way is it Python's fault that the dbm database doesn't reclaim disk space? It's actually how most databases work. Even a simple Outlook pst file (which is a database, too) works this way. I thought everyone knows or heard about this. Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how long?
* Ben Waldin (Tue, 3 Jul 2007 19:46:42 +1200) How long will it take until I successfully create my own working program that is useful? I have crated the address book ones in the tutors and just want to know how long it takes before I start to create my own thought up programs that will be useful. Thanks Ben Approximately ten days, four hours and six minutes ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Power Shells [WAS:] optimization: faster than for
* elis aeris (Sun, 1 Jul 2007 22:27:11 -0700) uh, can i ask about something very quickly? Don't hijack a completely unreleated thread. how do i write a function to do a pop up window with designated window name, type (ok, cancel, those) and message? Okay, a very quick answer: EasyGUI ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] pop up window
* elis aeris (Mon, 2 Jul 2007 02:32:07 -0700) i won't do that again, i am a 2 day newbie (hello) uh, how about a less quick one that's built-in in python ? Are you replying to me? Please quote the parts you are referring to. Anyway, Python does not come with built-in pop-up support. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] #!/usr/bin/env python vs #!/usr/local/bin/python
* (Thu, 14 Jun 2007 13:14:13 +0300) how to choose between #!/usr/bin/env python and #!/usr/local/bin/python in the beginning of the script ? Just choose. Say I want to the script. Say I want '#!/usr/bin/env python' ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] easygui question, again
* Rafael Bejarano (Sun, 10 Jun 2007 20:49:40 -0500) As I understand it from the description of this list, that is exactly its purpose--to help people who no relatively little python. That's correct. But your problem (or the solution to your problem) is more related to _Operating System_ basics as to Python basics (see also Alan Gaulds response). And please don't send me private email. Thanks, Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] easygui question, again
* Rafael Bejarano (Sun, 10 Jun 2007 02:24:56 -0500) On Jun 9, 2007, at 5:26 AM, Kent Johnson wrote: You could try running the easygui demo - just type python easygui.py on the command line from the directory containing easygui. At your convenience, please explain the above statement. I don't know what from the command line means. It would really make sense if you learn a bit of the basics before you start doing the advanced stuff like (Python) programming... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] easygui question, again
* Rafael Bejarano (Sun, 10 Jun 2007 19:35:32 -0500) On Jun 10, 2007, at 5:00 PM, Thorsten Kampe wrote: It would really make sense if you learn a bit of the basics before you start doing the advanced stuff like (Python) programming... What do you mean by a bit of the basics? Well, like - what is a command line, how do I change from one directory to another and stuff. The basics... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Multi-line comments?
* Brad Tompkins (Wed, 6 Jun 2007 16:41:31 -0700) Is there a way to make use of multi-line comments when programming using python? Having to stick a # in front of every line gets pretty tedious when I want to make a comment more detailed than I normally would. If there isn't a way, can someone recommend a text editor (I know emacs and probably vi can do this, but they seem difficult to use) that will comment out blocks of text automatically for me? EditPad Pro under Windows and Komodo Edit from ActiveState... ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] lists - append - unique and sorted
* roberto (Wed, 6 Jun 2007 17:17:05 +0200) can i append a item to a list using criterias: - UNIQUE - if there already exist don't append test whether it's already in the with in or use sets and/or - SORTED - INSERT in the correct place using some criteria? insert and then sort again by this criterion ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] installing maya/python on linux
* Preecha Bundrikwong (Mon, 4 Jun 2007 16:07:49 +0700) Can anybody please give me an easy instruction on installing maya/python (pysource/sourcepy etc.) on a Linux machine. http://cgkit.sourceforge.net/mayadoc/install.html I've already downloaded it but never succeeded installing. Aha. Why? BTW, there's no way to make installing process easier to life than this? (all those compile, source, .so, etc.. h...) http://cgkit.sourceforge.net/support.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] SSH using python
* Chandrashekar (Mon, 4 Jun 2007 01:45:57 -0700 (PDT)) Can anyone tell me how to do ssh to a machine using python and execute programs on the remote machine? Thanks in advance. Paramiko ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] installing maya/python on linux
* Preecha Bundrikwong (Mon, 4 Jun 2007 17:30:03 +0700) Thanks, but sorry again; how do you 'compile' the downloaded package? I'm new to Linux :-( ./configure make make install ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Creating a closed source application in Python?
* Sophie Marston (Mon, 28 May 2007 09:56:45 +0100) Is it possible to create a closed source project in Python? Like in C++ or something, where they can't view your code? Google for Python code obfuscation (web and comp.lang.python) Thorsten ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] trouble with if
* Rikard Bosnjakovic (Mon, 28 May 2007 17:55:42 +0200) On 5/28/07, Thorsten Kampe [EMAIL PROTECTED] wrote: Do you really think someone can or will read what you wrote? I've never seen something so horribly formatted like you emails - and I've seen lots of awful formatted emails... Looks fine at my end. As Brian van den Broek said[1] to the Hotmail guy: snip of all previous exchanges which are too badly formatted to be readable. Maybe because he's posting HTML and the text part is complete crap. *Hotmail* *gnarrf*. Thorsten [1] http://permalink.gmane.org/gmane.comp.python.tutor/40742 ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] html links
* max . (Mon, 14 May 2007 20:27:15 -0600) does anyone know of a tutorial for finding links in a web site with python. import formatter, \ htmllib, \ urllib url = 'http://python.org' htmlp = htmllib.HTMLParser(formatter.NullFormatter()) htmlp.feed(urllib.urlopen(url).read()) htmlp.close() print htmlp.anchorlist ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
