🌐 Mailman 3 June 2002 - Python-list - python.org

Migrating from PHP to Python...
by Rick Shin June 1, 2002

June 1, 2002

Hi, I'm a PHP man looking to migrate to Python for a change of scenery. I've skimmed over the specs, but missed a few PHP constructs that I find essential. Can anyone tell me the Python equivalents for: 1. include()/require() (is the import function meant for all file includes?) 2. header() (for redirecting) 3. variable variables (or dynamic variables) 4. PHPlib's template.inc (this isn't a construct, but a templating class I find indispensable) Finally, as someone who develops web apps exclusively, can anyone give me any compelling reasons why I should learn Python? From what I've read, PHP is faster, less resource intensive, and more prevalent (especially with web hosts). I've had, on the other hand, no formal training but recently read Code Complete, and wish to transcend the ranks of hackers. Python seems like an ideal language for instilling good, modular programming practices. Plus, it sounds cool. I like the idea of telling people "I program Python!". Thanks for reading this, Rick

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Core Python programming
by gusraan＠terra.com.br June 1, 2002

June 1, 2002

I wanna buy this book , for i heard it is PERFECT for a beginner , but i saw it , and it was released in 2000, will i get obsolete if buy it today, and will i have problems with the new features included after 2000?

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Gordon McMillan's Installer - Data files in the archive
by Paul Moore June 1, 2002

June 1, 2002

I see from the documentation of Gordon McMillan's Installer that you can include arbitrary data files in a built executable, using something like (from the documentation) collect = COLLECT(a.binaries + [('readme', '/my/project/readme', 'DATA')], ...) Given that you can do this, how do you get at the file from within your application? In a --onedir build, the data files are part of the directory, so you can just find them via sys.executable. But in a --onefile build, how do you get at them? Also, can you make a --onedir build include data files in the generated EXE, not as separate files? On a (semi-) related note, is it possible to make Installer *not* track dependencies back into the installed copy of Python, and so produce executables which assume the existence of an installed copy of Python on the target system? For a simple test application using wxPython, the base EXE in a --onedir build was 350K, whereas the support DLLs were nearly 8M. If I'm only distributing to people who I can rely on to have Python and wxPython installed, the saving in bandwidth is enormous. (OK, so I could send out a ZIP of the application plus data files, but a single-file "just run this EXE" distribution really is a good thing...) [As you can imagine, this all sort of stems from the recent "JAR file equivalent for Python" thread, and my wondering if Installer was a reasonable match for the required functionality...] Thanks, Paul.

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Jython: Getopt does not throw exception - 1 attachments
by j.bodemann＠gmx.de June 1, 2002

June 1, 2002

Hello all, does anybody know why the following code does not throw an excetion if the script is started without parameter? jython question.py begin 644 question.py M:6UP;W)T(&=E=&]P=`T*:6UP;W)T('-Y<PT*#0ID968@=7-A9V4H*3H-"@EP M<FEN="`B4V]M92!A<F=U;65N=',@;6ES<VEN9R(-"@ES>7,N97AI="@P*0T* M"0T*=')Y.@T*"6]P=',L(&%R9W,@/2!G971O<'0N9V5T;W!T*'-Y<RYA<F=V M6S$Z72P@(G,Z93HB+"!;(G-T87)T/2(L(")E;F1E/2)=*0T*97AC97!T(&=E M=&]P="Y'971O<'1%<G)O<CH-"@EU<V%G92@I#0IO=71P=70@/2!.;VYE"F9O M<B!O+"!A(&EN(&]P=',Z#0H):68@;R!I;B`H(BUS(BP@(BTM<W1A<G0](BDZ M#0H)"7-T87)T(#T@80T*"6EF(&\@:6X@*"(M92(L("(M+65N9&4](BDZ#0H) 2"65N9&4@/2!A"0T*"0D-"@D) ` end

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Behavior of += (was Re: [Python-Dev] Customization docs)
by jepler＠unpythonic.net June 1, 2002

June 1, 2002

On Sat, Jun 01, 2002 at 09:32:39AM -0400, David Abrahams wrote: > My question was about what a new type needs to do in order for things to > work properly in Python. If, as I had incorrectly assumed, Python were > checking a type's mutability before deciding whether it would be putting > the result back into the sequence, I would need to know what criteria > Python uses to decide mutability. IMO the following is an odder behavior: >>> t ([1], [2], [3]) >>> t[1] += [3] Traceback (most recent call last): File "<stdin>", line 1, in ? TypeError: object doesn't support item assignment >>> t ([1], [2, 3], [3]) Jeff

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Re: python tool: finding duplicate code
by Ira Baxter June 1, 2002

June 1, 2002

If you are interested in strong clone detection, you should check out http://www.semdesigns.com/Products/Clone/index.html -- Ira Baxter, Ph.D. CTO Semantic Designs www.semdesigns.com 512-250-1018 "Michal Wallace" <sabren(a)manifestation.com> wrote in message news:mailman.1022676587.23318.python-list@python.org... > > In "Refactoring: Improving the Design of Existing Code", > Martin Fowler and Kent Beck list duplicate code as their > number one "Code Smell" > > Since I'm looking to clean up some of my projects, I went > looking for a way to find duplicate lines in my python > project... So I wrote a little python program to do it for > me. > > Features: > > - lists all pairs of overlapping files > - shows how many lines are in common > - shows each duplicated line > - ignores indentation > - filters out try, pass, if __name__=="__main__", etc. > > It's just string-matching, so it won't find duplicate logic > with different variable names or layout, but it *can* find > cut and paste issues. > > (hmm... Come to think of it, someone could probably find > *some* duplicate logic by running source files through the > tokenizer first. I wonder if that would work...) > > Anyway, just thought I'd share: > > http://cvs.sabren.com/sixthdev/cvsweb.cgi/sdunit/overlaps.py?rev=1.1 > > Cheers, > > - Michal http://www.sabren.net/ sabren(a)manifestation.com > ------------------------------------------------------------ > Learn to build web apps! http://www.webAppWorkshop.com/ > ------------------------------------------------------------ > > >

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Using nntplib
by jb June 1, 2002

June 1, 2002

Let us assume I send a LIST command to the server. Then I get a short list of the newsgroups, the server offers. Getting for example 100,000 lines from 'goliath.newsfeeds.com' takes more than a "few minutes", as Outlook, that I used to use in my MS-life, puts it. Now the point is, that nntplib works synchronously(!), that means that the thread is waiting on the LIST command until the server sends it's terminating '.' and all the time the temporary file the socket has created is polled. (1) This is a terrible method, but the handling of the sommands should be done in another thread, so maybe it is o.k. (I thought, I should do all this myself and use QSockets, but alas! they are not supported by PyQt, however wonderful PyQt is.) (2) But I cannot monitor the whole procedure, that is I cannot see, how many lines have arrived already. (3) QUESTION: How can I do the monitoring I mentioned in (2)? A possibility is to tune the file nntplib.py (that is, CHANGING A SYSTEM FILE!). Here is a part of nntplib.py: def getlongresp(self, file=None): """Internal: get a response plus following text from the server. Raise various errors if the response indicates an error.""" openedFile = None try: # If a string was passed then open a file with that name if isinstance(file, types.StringType): openedFile = file = open(file, "w") resp = self.getresp() if resp[:3] not in LONGRESP: raise NNTPReplyError(resp) list = [] while 1: line = self.getline() if line == '.': break if line[:2] == '..': line = line[1:] if file: ############ inserted by J.B. ####### ### HERE SOMETHING SHOULD BE DONE ### ##################################### file.write(line + "\n") else: list.append(line) finally: # If this method created the file, then it must close it if openedFile: openedFile.close() return resp, list So what should I do? Rasing an excepton? And should not nntplib di this? TIA, -- Janos Blazi "Il n'y a gu�re dans la vie qu'une pr�occupation grave: c'est la mort;" (Dumas) -----------== Posted via Newsfeeds.Com - Uncensored Usenet News ==---------- http://www.newsfeeds.com The #1 Newsgroup Service in the World! -----= Over 100,000 Newsgroups - Ulimited Fast Downloads - 19 Servers =-----

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Code Folding with Emacs
by gb＠cs.unc.edu June 1, 2002

June 1, 2002

It is really easy to get code folding going with Python mode in Emacs. Just use the builtin outline-minor-mode and set up the outline-regexp and outline-level to work with Python. It really works well for me and has a nice menu or keyboard interface as well. Here is what I put in my .emacs to make it work. gb ;; setup python mode (setq auto-mode-alist ; trigger python mode automatically (cons '("\\.py$" . python-mode) auto-mode-alist)) (setq interpreter-mode-alist (cons '("python" . python-mode) interpreter-mode-alist)) (autoload 'python-mode "python-mode" "Python editing mode." t) ; add my customization (add-hook 'python-mode-hook 'my-python-hook) ; this gets called by outline to deteremine the level. Just use the length of the whitespace (defun py-outline-level () (let (buffer-invisibility-spec) (save-excursion (skip-chars-forward "\t ") (current-column)))) ; this get called after python mode is enabled (defun my-python-hook () ; outline uses this regexp to find headers. I match lines with no indent and indented "class" ; and "def" lines. (setq outline-regexp "[^ \t]\\|[ \t]*\$def\\|class\$ ") ; enable our level computation (setq outline-level 'py-outline-level) ; do not use their \C-c@ prefix, too hard to type. Note this overides some python mode bindings (setq outline-minor-mode-prefix "\C-c") ; turn on outline mode (outline-minor-mode t) ; initially hide all but the headers (hide-body) ; I use CUA mode on the PC so I rebind these to make the more accessible (local-set-key [?\C-\t] 'py-shift-region-right) (local-set-key [?\C-\S-\t] 'py-shift-region-left) ; make paren matches visible (show-paren-mode 1) )

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EuroPython2002: Extention of Early-Bird registration
by Tom Deprez June 1, 2002

June 1, 2002

Hi, Due to the fact that at the end of the early-bird date, lot's of people waked up and registered for the congress (and because of the possible internet problems caused by the bancruptcy of KPNQwest), we've extended the early bird until 9th of June. We hope that the doubters among us, will find this interesting now that they are still able to profit from the early bird registration. But be warned, this is the final date! At the moment we've reached a total of more than 150 people at the EuroPython congress. That's already nice for a first congress, but it should be more.... Don't you think you could make great deals with people over there? There must be somebody to whom you can speak about a certain problem. With 150 people, it must be possible to make some friends or to see some old ones back... It can't be that Europe has only such a small group of Python and/or Zope developers/users. What about people outside of Europe? Have you seen the talks? It must be worthwhile to pay a visit to the conference.... and if not... well enjoy the Belgian beer, chocolates and food..... that's something I'm sure you will never forget! And now the early bird registration has been extended, .... so if you had doubts earlier, throw them away and just visit EuroPython2002! Don't forget to visit the http://europython.zope.nl/interviews page, which will be regulary updated with new interviews of people comming to EuroPython2002. Regards, EuroPython Team.

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RE: Why no open(f, "w").write()?
by Delaney, Timothy June 1, 2002

June 1, 2002

> From: pinard(a)iro.umontreal.ca [mailto:pinard@iro.umontreal.ca] > > The current (C-)Python implementation is of high quality on > that respect, > and after checking with knowledgeable people, I got that the > dependability > of refcounts could be considered as cast in stone, exactly > like if it has > been documented as such. If I did not get this confirmation > first, I would > never have started to use things like "open(FILE, > 'w').write(CONTENTS)". > Now, I really see it as part of (unwritten) specifications of > (C-)Python, > and perfectly legitimate. I can come up with a perfectly good example where open(FILE, 'w').write(CONTENTS) will fail to close the file in CPython. There are no guarantees that the reference to the object returned is the *only* reference to that object. Assume the following (perverse) implementation of open: __files = [] def open (path, mode): f = __open(path, mode) __files.append(f) return f or class file: __files = [] def __init__(self, path, mode): __files.append(self) Whilst I know this is not the implementation, there is nothing that prevents it from being like this. So you get back an object that has one more reference count than expected. It never gets collected. You should never rely on automatic freeing of *any* resources unless it is guaranteed. Always explicitly free resources when you have finished with them. Tim Delaney

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