[ANN] TurboGears 1.1rc1 released
On behalf of the TurboGears Team, I am pleased to announce that TurboGears 1.1rc1 is available for download at http://turbogears.org/ and the Python package index http://pypi.python.org/pypi/TurboGears TurboGears 1.1rc1 is the first release candidate for the upcoming 1.1 release, which is the evolution of the TurboGears 1 codebase. The 1.1 branch now uses SQLAlchemy as the default database layer and Genshi as the standard templating engine but is 100 percent compatible with applications built on TurboGears 1.0. We encourage you to test this release with your existing TurboGears 1.0 applications and by building new ones. If no major problems are reported, this release will become 1.1final in about two weeks. Beta versions of TurboGears 1.1 have been in use in production environments for over a year now, so we believe this release is rock-stable. What is TurboGears? --- TurboGears is a rapid development, front-to-back, open source web meta-framework. Its aim is to simplify and speed up the development of modern web applications written in the Python programming language. TurboGears is designed around the model-view-controller architecture, much like Struts or Ruby on Rails, and takes the best Python web components available (hence meta-framework) and combines them into one easy-to-install, documented whole. What's new? --- Apart from the change of defaults to SLQAlchemy and Genshi, TurboGears 1.1 has a new testing framework built on WebTest, a new quickstart design (backported from TurboGears 2) and many, many bigger and smaller fixes and improvements over version 1.0 in its internals. For a comprehensive list of changes see the changelog in our Trac at http://trac.turbogears.org/wiki/ChangeLog How to install? --- The easiest way to install TurboGears 1.1rc1 is via setuptools: [sudo] easy_install [-f http://turbogears.org/download/] TurboGears we recommend that you install TurboGears into its own virtual environment using the virtualenv tool: [sudo] easy_install virtualenv virtualenv --no-site-packages /path/to/tgenv source /path/to/tgenv/bin/activate easy_install [-f http://turbogears.org/download/] TurboGears How is it related to TurboGears 2? -- TurboGears 1.1 is based on the original TurboGears 1.0 codebase and still uses CherryPy 2.3 as the underlying web application server. It is 100 percent compatible with existing TurboGears 1.0 applications and porting an application using SQLObject and Kid to use SQLAlchemy and Genshi is easiliy achieved. TurboGears 2 has almost the same API as TurboGears 1.x but builds on Pylons as the underlying web engine. Most new development for TurboGears now happens in version 2, but the 1.1 branch will be continued to be supported and maybe even developed further for the foreseeable future. The Future -- TurboGears 1.1 final is slated to be released in about two weeks. Afterwards we plan to issue a maintenance release for the TurboGears 1.0 branch, which would be version 1.0.9. Further development on the TurboGears 1.1 branch depends on community feedback, which we plan to collect by conducting an online survey amongst TurboGears users. You may expect a separate announcement for this very soon! Share enjoy! -- Christopher Arndt sysad...@turbogears.org TurboGears Systems Administrator http://www.turbogears.org/ -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANN]: IronPython 2.6 Release Candidate 1
Hello Python Community, We're pleased to announce the release of IronPython 2.6 Release Candidate 1 which can be freely downloaded at http://ironpython.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=30315. Over the development span of IronPython 2.6, exactly 417 bugs have been fixed. Since the release of Beta 2, we've addressed the following: * Non-hosting related APIs previously found in Microsoft.Scripting.dll have been migrated to Microsoft.Dynamic.dll. The rationale behind this decision is that we're aiming for compatible DLR binaries with the next major release of IronRuby, namely 1.0. Microsoft.Dynamic.dll will likely end up being a bit different between IronPython 2.6 and IronRuby 1.0, but we intend on keeping Microsoft.Scripting.dll and Microsoft.Scripting.Core.dll exactly the same. By doing this you'll be able to utilize the DLR hosting APIs to run both IronPython 2.6 and IronRuby 1.0 code from the same .NET application! * Documentation distributed with the release has been updated * A plethora of bugs have been fixed over the past two months with special emphasis given to CodePlex work items with lots of votes If no major issues with this release candidate are discovered, we hope to ship the final 2.6 release in a little under a month. Anyone planning on upgrading to 2.6 should try out this release candidate and let us know of any issues you find ASAP. Thanks to everyone in the IronPython Community who reported bugs and provided valuable feedback: Zachc, yamakox, vernondcole, VAks, tscottw, tonyandrewmeyer, tomwright, TomasMatousek, tkamiya, timers, srivatsn, sopeajw, saveenr, sanxiyn, rridge, ronniemaor, quirogaco, pythonfoo, py_sunil, pm100, pl6306, paulfelix, orestis, olegt, oldman, NDHUMuscle, mycall, mmaly, mmacdonaldssfcu, maplpro, luntain, llaske, lbaker, Lawouach, laurionb, laughingboy, kurhan, kuno, kowenswp, klrohe, kevgu, jmesserly, jlunder, jdhardy, jbevain, jackeyoo, hhonisch, gz, gjones, fwereade, deadalusai, daveremy, darb, CurtHagenlocher, chaghi, cgravill, cartman, bobarnso, billchi, atifaziz, ashcor, alvanet, __Helmut__, fuzzyman, fabiofz, Eloff, egonw_, dungen, dsblank, dmajnemer, dinov, and dfugate. We really do appreciate your input which helps to make every release of IronPython better than the last. The IronPython Team -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Solved - Python: automate input to MySQL query
-- Forwarded message -- From: Philip Semanchuk phi...@semanchuk.com To: Python-list (General) python-list@python.org Date: Mon, 21 Sep 2009 08:49:27 -0400 Subject: Re: Python: automate input to MySQL query On Sep 21, 2009, at 5:18 AM, Threader Slash wrote: Hi Everybody... I have a query that works as follows: Code: db.query(SELECT traveler.travelerFirstName,vaccine.vaccineName from (traveler INNER JOIN takenvaccine ON traveler.travelerID = takenvaccine.travelerID) INNER JOIN vaccine ON takenvaccine.vaccineID=vaccine.vaccineID INNER JOIN requiredvaccine ON vaccine.vaccineID=requiredvaccine.requiredvaccineID INNER JOIN city ON requiredvaccine.cityID = city.cityID WHERE traveler.travelerFirstName = 'John') The output gives me all vaccines taken by a given employee. To allow the user to choose different names when running the system, I am trying to use a variable, named *person*: Code: person = John db.query(SELECT traveler.travelerFirstName,vaccine.vaccineName from (traveler INNER JOIN takenvaccine ON traveler.travelerID = takenvaccine.travelerID) INNER JOIN vaccine ON takenvaccine.vaccineID=vaccine.vaccineID INNER JOIN requiredvaccine ON vaccine.vaccineID=requiredvaccine.requiredvaccineID INNER JOIN city ON requiredvaccine.cityID = city.cityID WHERE traveler.travelerFirstName = 'person') Then I run the query inside my python program. The first version without variable works fine. But the second, using variable, doesn't give me any output. What I am missing here about the python variable sintaxe to make the MySQL work with variable ... Any suggestion? In your second query you've got person hardcoded as a string. You're looking for a traveler with the actual first name of person. Change this line: WHERE traveler.travelerFirstName = 'person') to this: WHERE traveler.travelerFirstName = %s) and pass person as a list of params to db.query(). Something like this should work: sql = SELECT blah blah blah WHERE traveler.travelerFirstName = %s db.query(sql, [person]) See the Python DB API documentation for specifics. This might look like the same thing as string interpolation, but it isn't. Good luck Philip Hi Philip, Thanks for comments and suggestions. Now it works! Here is the solution: Code: self.db = MySQLdb.connect(hostname,username,passwd,dbname) self.cursor=self.db.cursor(); name=John runQuery=SELECT traveler.travelerFirstName,vaccine.vaccineName from traveler INNER JOIN takenvaccine ON traveler.travelerID = takenvaccine.travelerID INNER JOIN vaccine ON takenvaccine.vaccineID=vaccine.vaccineID INNER JOIN requiredvaccine ON vaccine.vaccineID=requiredvaccine.requiredvaccineID INNER JOIN site ON requiredvaccine.siteID = site.siteID WHERE traveler.travelerFirstName = %s self.cursor.execute(runQuery,(name,)) print tell vaccines taken for a chosen traveler\n for row in self.cursor.fetchall(): print row Note: you need to declare the whole query in the same line to it take effect in the variable runQuery. -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On Sep 20, 10:27 pm, daggerdvm dagger...@yahoo.com wrote: Write the definition of a function twice , that receives an int parameter and returns an int that is twice the value of the parameter. how can i do this I will stop this theatre... as you should know, you want your function to make arithmetic operation n*2. Everything you have to do is to define some function with parameter n and make this function to return n*2. If you are not jerk, you can make the whole code you need from the previous sentence :))) -- http://mail.python.org/mailman/listinfo/python-list
[SQL] Pick random rows from SELECT?
Here is a simple and quick solution -- Generate a random number random.shuffle(x[, random])¶Shuffle the sequence x in place. The optional argument random is a 0-argument function returning a random float in [0.0, 1.0); by default, this is the function random(). http://docs.python.org/library/random.html Multiple the random value returned by the maxnumber of your table primary key index. http://www.tizag.com/mysqlTutorial/mysqlmax.php Then use the result in your query as randID = MAX(id) * random() SELECT objectname FROM products WHERE objectID = randID Hope this help. Cheers... Threader -- Forwarded message -- From: Dennis Lee Bieber wlfr...@ix.netcom.com To: python-list@python.org Date: Mon, 21 Sep 2009 21:40:02 -0700 Subject: Re: [SQL] Pick random rows from SELECT? On Mon, 21 Sep 2009 10:59:38 +0200, Gilles Ganault nos...@nospam.com declaimed the following in gmane.comp.python.general: Since this list is quite big and the site is the bottleneck, I'd like to run multiple instances of this script, and figured a solution would be to pick rows at random from the dataset, check in my local database if this item has already been taken care of, and if not, download details from the remote web site. You really think making MULTIPLE, overlapping requests to a web site is going to be more efficient than just suffering the single transfer time of one large query? If someone's done this before, should I perform the randomization in the SQL query (SQLite using the APSW wrapper http://code.google.com/p/apsw/), or in Python? Pardon, I thought you implied the bottleneck is the web-site database -- I'd worry about any web-site that exposes a file-server based database to direct user access. Here's some simplified code: sql = 'SELECT id,label FROM companies WHERE activity=1' rows=list(cursor.execute(sql)) for row in rows: id = row[0] label = row[1] print strftime(%H:%M) url = http://www.acme.com/details.php?id=%s; % id req = urllib2.Request(url, None, headers) response = urllib2.urlopen(req).read() name = re_name.search(response) if name: name = name.group(1) sql = 'UPDATE companies SET name=? WHERE id=?' cursor.execute(sql, (name,id) ) Ah... You mean you are retrieving the names from a local database, and then requesting web-site details based upon that name. No matter how you look at it, you appear to want to process the entire local list of companies... Multiple randomized local queries will just add to the final run-time as you start to get duplicates -- and have to reject that one to query for another random name. I'd suggest either a pool of threads -- 5-10, each reading company names from a shared QUEUE, which is populated by the main thread (remember to commit() so that you don't block on database updates by the threads). OR... determine how many companies there are, and start threads feeding them start and length (length being #names / #threads, round up -- start then being 0*length+1, 1*length+1, etc...) and use those in thread specific selects using ... limit length offset start... This way each thread retrieves its own limited set of companies (make sure to use the same sorting criteria). -- Wulfraed Dennis Lee Bieber KD6MOG wlfr...@ix.netcom.com HTTP://wlfraed.home.netcom.com/http://wlfraed.home.netcom.com/ -- Forwarded message -- From: greg g...@cosc.canterbury.ac.nz To: python-list@python.org Date: Tue, 22 Sep 2009 17:07:33 +1200 Subject: Re: Comparison of parsers in python? Nobody wrote: What I want: a tokeniser generator which can take a lex-style grammar (not necessarily lex syntax, but a set of token specifications defined by REs, BNF, or whatever), generate a DFA, then run the DFA on sequences of bytes. It must allow the syntax to be defined at run-time. You might find my Plex package useful: http://www.cosc.canterbury.ac.nz/greg.ewing/python/Plex/ It was written some time ago, so it doesn't know about the new bytes type yet, but it shouldn't be hard to adapt it for that if you need to. What I don't want: anything written by someone who doesn't understand the field (i.e. anything which doesn't use a DFA). Plex uses a DFA. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Hi, SOAP lib for Python 3.0
Hi, Does anyone have a reccommendation on the best soap library for Python 3.0? The libs I found only support python 2.6 or belove. Otto -- http://mail.python.org/mailman/listinfo/python-list
Re: using python 2.5
kunal.k wrote: I have installed python 2.5 for a particular code. Now i have 2.6 already installed. How do i direct this code to use the 2.5 modules?? I can think of two different questions you might be asking. 1) How do I get the add-on modules installed with 2.6 to also work in 2.5? or 2) How do I get a particular script to use 2.5, while all other scripts should use 2.6 ? Sean answered #1, but I think you meant to ask #2 First question is what OS you've installed these on. In Windows, the python version is selected by file associations, while in Unix/Linux systems, it's selected by the shebang line at the beginning of the script. A generic answer if you just have one script is to make an OS script (bat file, or shell script) that invokes the particular python interpreter, passing it the script name as an argument). But if you want to be able to just run the script as though it were a compiled executable, tell us what OS you're on, and maybe the base locations of your two installations. DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On Monday, 21 September 2009 22:50:31 daggerdvm wrote: carl banks.you are a dork No mister_do_my_homework, he is not. He is actually a respected member of this little community. You, however, are beginning to look like one. Why do you not come clean - tell us what you are doing, show us what you have tried, and maybe, just maybe, some kind soul will help you, instead of mocking you. Although that is now less likely as you have started calling people derogatory names. And if you do not at least do what I have suggested, there is about a snowball's hope in hell of anybody helping you, as you come across as a parasite who wants other people to do his work. Prove you are not, or go away. - Hendrik -- http://mail.python.org/mailman/listinfo/python-list
Re: where is ctrl+newline handled in pywin editor?
C or L Smith wrote: I use the pywin environment on Windows for python code editing and interactive environment. I've been able to find the place in the editor files where the enter key is handled and where the whitespace is stripped from a line and I've been able to get it to not leave any white space when a double return is entered. But what I would like to be able to do is find the place where ctrl+enter is handled so I could have it strip any trailing space from the current line before going back to the left margin. Is anyone acquainted enough with the pywin editor to be able to help with this? Thanks, Chris -- http://mail.python.org/mailman/listinfo/python-list The key bindings are in \pythonwin\pywin\default.cfg. The current definition is Ctrl+Enter= ProcessEnter (same as a normal enter). ProcessEnterEvent in \pythonwin\pywin\framework\interact.py checks whether the shift or ctrl keys were used. Roger -- http://mail.python.org/mailman/listinfo/python-list
Re: passing object between classes
daved170 daved...@gmail.com wrote: Is there any existing python Log object that do so? There is. See Jean-Michel Pichavant's reply. I no, I created my own Log object that only open file and write a line to it, how can I make it be global? You could assign it to a global name. Should I use it as a static object? If you wish. It depends on exactly what you want. Usually static objects are fine for logging unless you want to be able to modify the logging in particular situations (e.g. when running your unit tests). In that case you could just assign it to an attribute of your object much as you were failing to do in your original post: there is no reason at all why that shouldn't work also. will it work? There is no reason why not. (offcurse in the case of the threads I'll use utex) With the built-in logging module you don't need to worry about that. -- Duncan Booth http://kupuguy.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for a pure Python chart drawing module
John Nagle na...@animats.com wrote: I'm looking for something that can draw simple bar and pie charts in Python. I'm trying to find a Python package, not a wrapper for some C library, as this has to run on both Windows and Linux and version clashes are a problem. Here's the list from the Python wiki at http://wiki.python.org/moin/NumericAndScientific/Plotting;. Almost all the options are really wrappers for some other package in C/C++. [snip] So, for pure Python, Pychart is it. I'll have to try it and see if it still works. I don't think anyone has mentioned reportlab... It can plot charts I think, though last time I used it I plotted stuff by hand as I wanted exact control over the layout. I'm not sure of the dependencies though so may not be suitable for your purposes. http://www.reportlab.org/rl_toolkit.html -- Nick Craig-Wood n...@craig-wood.com -- http://www.craig-wood.com/nick -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
daggerdvm wrote: what are you retarded? this is not a test you moron, i can ask all the questions i want about it. You seem to have forgotten to CC the list. Let me help show the world your mad skillz -- at replying, at programming, at orthography, at interpersonal communication... Sure you can ask all the questions you want...and the newsgroup can give all the answers it sees fit. In all likelihood, your professor wanted *you* to solve the problem, not have comp.lang.python solve the problem for you. You got at least two answers that solve the problem, but were designed to clearly indicated to the professor that you didn't author them yourself. From my experience teaching students to program, that's the sort of problem that 4th or 5th graders (who have been paying attention in class) should be able to do with no need to ask for help. Given that you made *no* effort (your post had *zero* code to show you had even attempted the problem), you got back far more than you put in. -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: recommendation for webapp testing?
I need to do some basic website testing (log into account, add item to cart, fill out and submit forms, check out, etc.). What modules would be good to use for webapp testing like this? Windmill is an option, but I haven't tried it myself I'll second Windmill as an option, have had good experiences with it. The current version is a little on the slow side, but I believe there's a big new release just around the corner that contains significant performance improvements. Ryan -- Ryan Kelly http://www.rfk.id.au | This message is digitally signed. Please visit r...@rfk.id.au| http://www.rfk.id.au/ramblings/gpg/ for details signature.asc Description: This is a digitally signed message part -- http://mail.python.org/mailman/listinfo/python-list
difficulty in understanding rsplit(None,1)[1]
Hi What does rsplit(None,1)[1] accomplish. Can somebody please decompose that to me. regards -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
you brain needs error checking! -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On Mon, 21 Sep 2009 13:46:31 -0700 (PDT) daggerdvm dagger...@yahoo.com wrote: u don't want to answerthen why post?...get lost. You're not doing yourself a favor with this attitude, much less displaying it. You asked a question that you could have solved with 1 hour's worth of reading at most (much less if you're actually attending some sort of class for this). I'm not saying you deserve to be mocked, but it is a fact of life that you get these responses when it is apparent that you put almost no effort into this problem. Here's a tip: post to the group your code that you came up with yourself and explain what gives you trouble. I assure you, the responses will be more helpful that way. /W -- INVALID? DE! -- http://mail.python.org/mailman/listinfo/python-list
problem in encryption
hello ,
The community members,
Using following code :
fileHandle = open ('jay1key.py','wb')
#fileHandle = open ('jay1key.pem',rb).read()
print fileHandle.write (data) #data variable is contains the key
fileHandle.close()
otp = 'jyshri69'
pub_key = M2Crypto.RSA.load_pub_key('jay1key.py')
encrypted = pub_key.public_encrypt(otp, M2Crypto.RSA.pkcs1_padding)
print encrypted text is =
print ---
print encrypted
the above code gives me following error :
None
Traceback (most recent call last):
File RetEnc.py, line 71, in ?
pub_key = M2Crypto.RSA.load_pub_key('jay1key.py')
File /usr/lib/python2.4/site-packages/M2Crypto/RSA.py, line 344,
in load_pub_key
return load_pub_key_bio(bio)
File /usr/lib/python2.4/site-packages/M2Crypto/RSA.py, line 360,
in load_pub_key_bio
rsa_error()
File /usr/lib/python2.4/site-packages/M2Crypto/RSA.py, line 240,
in rsa_error
raise RSAError, m2.err_reason_error_string(m2.err_get_error())
M2Crypto.RSA.RSAError: no start line
not getting how to resolve it ?
--
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Re: problem in encryption
On Sep 22, 1:44 pm, jayshree jayshree06c...@gmail.com wrote:
hello ,
The community members,
Using following code :
fileHandle = open ('jay1key.py','wb')
#fileHandle = open ('jay1key.pem',rb).read()
print fileHandle.write (data) #data variable is contains the key
fileHandle.close()
otp = 'jyshri69'
pub_key = M2Crypto.RSA.load_pub_key('jay1key.py')
encrypted = pub_key.public_encrypt(otp, M2Crypto.RSA.pkcs1_padding)
print encrypted text is =
print ---
print encrypted
the above code gives me following error :
None
Traceback (most recent call last):
File RetEnc.py, line 71, in ?
pub_key = M2Crypto.RSA.load_pub_key('jay1key.py')
File /usr/lib/python2.4/site-packages/M2Crypto/RSA.py, line 344,
in load_pub_key
return load_pub_key_bio(bio)
File /usr/lib/python2.4/site-packages/M2Crypto/RSA.py, line 360,
in load_pub_key_bio
rsa_error()
File /usr/lib/python2.4/site-packages/M2Crypto/RSA.py, line 240,
in rsa_error
raise RSAError, m2.err_reason_error_string(m2.err_get_error())
M2Crypto.RSA.RSAError: no start line
not getting how to resolve it ?
the key looks like this :
-BEGIN RSA PUBLIC KEY-
mQGiBEpz7VIRBADAt9YpYfYHJeGA6d
+G261FHW1uA0YXltCWa7TL6JnIsuxvh9vImUoyMJd6
1xEW4TuROTxGcMMiDemQq6HfV9tLi7ptVBLf/8nUEFoGhxS
+DPJsy46WmlscKHRIEdIkTYhp
uAIMim0q5HWymEqqAfBLwJTOY9sR+nelh0NKepcCqwCgvenJ2R5UgmAh
+sOhIBrh3OahZEED
/2sRGHi4xRWKePFpttXfb2hry2/jURPae/wYfuI6Xw3k5EO593veGS7Zyjnt+7mVY1N5V/
ey
rfXaS3R6GsByG/eRVzRJGU2DSQvmF+q2NC6v2s4KSzr5CVKpn586SGUSg/
aKvXY3EIrpvAGP
rHum1wt6P9m9kr/4X8SdVhj7Jti6A/0TA8C2KYhOn/
hSYAMTmhisHan3g2Cm6yNzKeTiq6/0
ooG/
ffcY81zC6+Kw236VGy2bLrMLkboXPuecvaRfz14gJA9SGyInIGQcd78BrX8KZDUpF1Ek
KxQqL97YRMQevYV89uQADKT1rDBJPNZ+o9f59WT04tClphk/
quvMMuSVILQaamF5c2ggPGph
eXNocmVlQGdtYWlsLmNvbT6IZgQTEQIAJgUCSnPtUgIbAwUJAAFRgAYLCQgHAwIEFQIIAwQW
AgMBAh4BAheAAAoJEFjpOQ2vjFvzS0wAn3vf1A8npIY/DMIFFw0/
eGf0FNekAKCBJnub9GVu
9OUY0nISQf7uZZVyI7kBDQRKc+1SEAQAm7Pink6S5+kfHeUoJVldb
+VAlHdf7BdvKjVeiKAb
dFUa6vR9az+wn8V5asNy/
npEAYnHG2nVFpR8DTlN0eO35p78qXkuWkkpNocLIB3bFwkOCbff
P3yaCZp27Vq+9182bAR2Ah10T1KShjWTS/
wfRpSVECYUGUMSh4bJTnbDA2MAAwUEAIcRhF9N
OxAsOezkiZBm+tG4BgT0+uWchY7fItJdEqrdrROuCFqWkJLY2uTbhtZ5RMceFAW3s
+IYDHLL
PwM1O+ZojhvAkGwLyC4F
+6RCE62mscvDJQsdwS4L25CaG2Aw97HhY7+bG00TWqGLb9JibKie
X1Lk+W8Sde/4UK3Q8tpbiE8EGBECAA8FAkpz7VICGwwFCQABUYAACgkQWOk5Da+MW/
MAAgCg
tfUKLOsrFjmyFu7biv7ZwVfejaMAn1QXEJw6hpvte60WZrL0CpS60A6Q
-END RSA PUBLIC KEY-
--
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Re: difficulty in understanding rsplit(None,1)[1]
hrishy wrote: Hi What does rsplit(None,1)[1] accomplish. Can somebody please decompose that to me. regards Sure: test = 'This is a test' help(test.rsplit) Help on built-in function rsplit: rsplit(...) S.rsplit([sep [,maxsplit]]) - list of strings Return a list of the words in the string S, using sep as the delimiter string, starting at the end of the string and working to the front. If maxsplit is given, at most maxsplit splits are done. If sep is not specified or is None, any whitespace string is a separator. step_two = test.rsplit(None, 1) step_two ['This is a', 'test'] step_two[1] 'test' -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On Monday 21 September 2009 22:49:50 daggerdvm wrote: you brain needs error checking! try: return response() except Troll,e: raise dontFeed(anymore=True) \d -- home: http://otherwise.relics.co.za/ 2D vector animation : https://savannah.nongnu.org/projects/things/ Font manager : https://savannah.nongnu.org/projects/fontypython/ -- http://mail.python.org/mailman/listinfo/python-list
Re: difficulty in understanding rsplit(None,1)[1]
Hi Martin Many thanks And by the way great way to explain that thing --- On Tue, 22/9/09, Martin P. Hellwig martin.hell...@dcuktec.org wrote: From: Martin P. Hellwig martin.hell...@dcuktec.org Subject: Re: difficulty in understanding rsplit(None,1)[1] To: python-list@python.org Date: Tuesday, 22 September, 2009, 9:52 AM hrishy wrote: Hi What does rsplit(None,1)[1] accomplish. Can somebody please decompose that to me. regards Sure: test = 'This is a test' help(test.rsplit) Help on built-in function rsplit: rsplit(...) S.rsplit([sep [,maxsplit]]) - list of strings Return a list of the words in the string S, using sep as the delimiter string, starting at the end of the string and working to the front. If maxsplit is given, at most maxsplit splits are done. If sep is not specified or is None, any whitespace string is a separator. step_two = test.rsplit(None, 1) step_two ['This is a', 'test'] step_two[1] 'test' -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: entry widget won't validate
Mike wrote:
On Sep 21, 12:47 pm, Peter Otten __pete...@web.de wrote:
Mike wrote:
I'm trying to arrange for an Entry widget to check whether its data
is all digits and whether the number represented is small enough.
The validate function seem to be called once at startup and not
afterwards:
The print statement run 3 times at startup.
Editing an Entry does not cause any printing.
Any ideas?
Quotinghttp://www.tcl.tk/man/tcl8.5/TkCmd/entry.htm#M12:
In general, the textVariable and validateCommand can be dangerous to mix.
Any problems have been overcome so that using the validateCommand will
not interfere with the traditional behavior of the entry widget. Using
the textVariable for read-only purposes will never cause problems. The
danger comes when you try set the textVariable to something that the
validateCommand would not accept, which causes validate to become none
(the invalidCommand will not be triggered). The same happens when an
error occurs evaluating the validateCommand.
You can verify that this is indeed your problem by changing the
Levels.vc() method to always return True for the moment.
Returning True does seems to cause vc to be called more often.
I'm still not getting the data I want though.
The variable always gives me the pre-change string.
I gather I need to do something with %P.
google gave me hints that I should use something called register,
but I'm not at all clear on what I should do with them.
I don't know how to translate from Tcl to python.
I don't know Tcl either; the following is the first thing that seemed to
work, after some trial and error:
import Tkinter as tk
def validate(before, after):
print before, --, after
return after.isdigit()
if __name__ == __main__:
root = tk.Tk()
name = root.register(validate)
cmd = 'expr {[%(name)s %(parms)s]}' % dict(name=name, parms=%s %P)
var = tk.StringVar()
entry = tk.Entry(root, textvariable=var,
validate=all, validatecommand=cmd)
entry.pack()
entry.focus_set()
root.mainloop()
Peter
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Combining sets/dictionaries
Hello, I have different sets/dictionaries/lists (whatever you want because I can convert them easily) and I would like to combine them. I don't want a consensus and something like it. I'd need to combine all elements of the first one with the all elements of the second one and third,... the numbers of dictionaries/sets/lists is variable as the number of elements for each one. For example, i have the following sets and I would like to obtain all possible combinations... ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] And it should be flexible because as I've said, the number of dictionaries/lists/sets is not always the same, as the number of elements. I don't like to ask this kid of questions but... today I'm totally lost and I need it to close one part of a nice project... Thanks in advance! Best regards, Alfons. -- Alfons Nonell-Canals, PhD Chemogenomics Lab Research Group on Biomedical Informatics (GRIB) - IMIM/UPF Barcelona Biomedical Research Park (PRBB) C/ Doctor Aiguader, 88 - 08003 Barcelona alfons.non...@upf.edu - http://cgl.imim.es Tel. +34933160528 http://alfons.elmeuportal.cat http://www.selenocisteina.info -- http://mail.python.org/mailman/listinfo/python-list
Re: Combining sets/dictionaries
Alfons Nonell-Canals wrote: I have different sets/dictionaries/lists (whatever you want because I can convert them easily) and I would like to combine them. I don't want a consensus and something like it. I'd need to combine all elements of the first one with the all elements of the second one and third,... the numbers of dictionaries/sets/lists is variable as the number of elements for each one. For example, i have the following sets and I would like to obtain all possible combinations... ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] And it should be flexible because as I've said, the number of dictionaries/lists/sets is not always the same, as the number of elements. I don't like to ask this kid of questions but... today I'm totally lost and I need it to close one part of a nice project... Using one common definition of combinations: from pprint import pprint pprint(items) [['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C'], ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C']] import itertools for c in itertools.combinations(items, 2): ... print c ... (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C']) (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C']) (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C']) (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C']) snip If you mean something else (likely) please give a more detailed description or provide some examples with both input and desired output. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On Sep 21, 1:27 am, daggerdvm dagger...@yahoo.com wrote: Write the definition of a function twice , that receives an int parameter and returns an int that is twice the value of the parameter. how can i do this Please note that most mails here are humorous - as should be expected for a language named after Monty Python. So, please do not get angry and do take it the way it was intended. The main problem that everybody sees is that the code you asked is extremely simple. This causes others to think that you have not invested any time in getting a solution yourself. Most of us here are 30 years old, and we know from experience that if one does not invest time and energy in solving issues when we are young, it eventually leads us to a very unrewarding and unhappy life in the end. So, even though it looks to you that people are mocking you, it is not exactly the case. If you do try to get a solution and is unable to do so, then I am 100% sure that many many people would have provided you the answer or the way to do so. Also, since you are young (presumably), it would be good to understand that if you get it into a flamewar (email or in life), it tends to end bad for you in the end. Esp, MRAB, Carl Banks, Steven D'Aprano, Tim Chase etc , whom you flamed, are amongst the most respected people in this group. -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter - Text - bullets
On Sep 22, 7:45 am, Thomas Lehmann iris-und-thomas-lehm...@t-
Online.de wrote:
This is probably why you had all these alignment problems. But it's
weird, because the script I posted is copied and pasted from a really
script that I've run, and which doesn't cause any error. What is the
version of tcl/tk used by your Tkinter module? And what is your Python
version?
Using python 2.5 (with Tcl/Tk 8.4):
Traceback (most recent call last):
File Text1.py, line 10, in module
txt.tag_configure('bulleted_list', font=('Times', 18),
lmargin1='10m', lmargin2='15m', tabs=['15m'])
File E:\Python25\lib\lib-tk\Tkinter.py, line 3066, in
tag_configure
return self._configure(('tag', 'configure', tagName), cnf, kw)
File E:\Python25\lib\lib-tk\Tkinter.py, line 1188, in _configure
self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
_tkinter.TclError: bad screen distance ['15m']
Try tabs='15m' instead. Seems the list is not handled properly.
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Re: socket send O(N**2) complexity
exarkun at twistedmatrix.com writes: To the OP, you can get view-like behavior with the buffer builtin. And, on Python 3 (or even the 2.7 in development), you can use the memoryview builtin for similar effect. Regards Antoine. -- http://mail.python.org/mailman/listinfo/python-list
Re: Combining sets/dictionaries
Hi, Did you try the list.update() builtin function ? Regards Peter Otten a écrit : Alfons Nonell-Canals wrote: I have different sets/dictionaries/lists (whatever you want because I can convert them easily) and I would like to combine them. I don't want a consensus and something like it. I'd need to combine all elements of the first one with the all elements of the second one and third,... the numbers of dictionaries/sets/lists is variable as the number of elements for each one. For example, i have the following sets and I would like to obtain all possible combinations... ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] And it should be flexible because as I've said, the number of dictionaries/lists/sets is not always the same, as the number of elements. I don't like to ask this kid of questions but... today I'm totally lost and I need it to close one part of a nice project... Using one common definition of combinations: from pprint import pprint pprint(items) [['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C'], ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C'], ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C']] import itertools for c in itertools.combinations(items, 2): ... print c ... (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C']) (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'O', 'N', 'P', 'S', 'C']) (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C']) (['I', 'O', 'N', 'P', 'S', 'C'], ['I', 'N', 'P', 'S', 'C']) snip If you mean something else (likely) please give a more detailed description or provide some examples with both input and desired output. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
Tim Roberts wrote: daggerdvm dagger...@yahoo.com wrote: carl banks.you are a dork What are you, eleven years old? Look, you asked us to answer for you what is CLEARLY a homework question. It is unethical for you to ask that, and it is unethical for us to answer it. Forget ethical. We can do his homework for him, we can perhaps pass exams for him, maybe graduate for him, and then with our luck, he'll get a job in our office and we get to do his work for him. Mel. -- http://mail.python.org/mailman/listinfo/python-list
Re: Combining sets/dictionaries
Alfons Nonell-Canals wrote: Hello, I have different sets/dictionaries/lists (whatever you want because I can convert them easily) and I would like to combine them. I don't want a consensus and something like it. I'd need to combine all elements of the first one with the all elements of the second one and third,... the numbers of dictionaries/sets/lists is variable as the number of elements for each one. For example, i have the following sets and I would like to obtain all possible combinations... ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] And it should be flexible because as I've said, the number of dictionaries/lists/sets is not always the same, as the number of elements. I don't like to ask this kid of questions but... today I'm totally lost and I need it to close one part of a nice project... Maybe a recursive function or generator: Each item from the first list appended to each of the possible combinations from the second through nth lists. Mel. -- http://mail.python.org/mailman/listinfo/python-list
Re: Not this one the other one, from a dictionary
Vlastimil Brom vlastimil.b...@gmail.com wrote: other_key = (set(data_dict.iterkeys()) - set([not_wanted_key,])).pop() other_key = set(data_dict.iterkeys()).difference([not_wanted]).pop() saves you the construction of an unnecessary set instance. At the cost of a bit more verbosity, you can get rid of a second set: key_set = set(data_dict.iterkeys()) key_set.difference_update([not_wanted_key]) other_key = key_set.pop() although the loss of clarity compared to the one liner can't be worth the miniscule benefit in this case. -- \S under construction -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
Mel mwil...@the-wire.com writes: Tim Roberts wrote: Look, you asked us to answer for you what is CLEARLY a homework question. It is unethical for you to ask that, and it is unethical for us to answer it. Forget ethical. We can do his homework for him, we can perhaps pass exams for him, maybe graduate for him, and then with our luck, he'll get a job in our office and we get to do his work for him. +1 QOTW -- \ “Special today: no ice cream.” —mountain inn, Switzerland | `\ | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: problem in encryption
jayshree jayshree06c...@gmail.com (j) wrote:
j hello ,
j The community members,
j Using following code :
j fileHandle = open ('jay1key.py','wb')
j #fileHandle = open ('jay1key.pem',rb).read()
j print fileHandle.write (data) #data variable is contains the key
j fileHandle.close()
j otp = 'jyshri69'
j pub_key = M2Crypto.RSA.load_pub_key('jay1key.py')
[Why do you give your key file a .py extension? .pem would be better.]
Your key in the next posting (when the broken lines are reconstructed)
seems to be in PKCS1 format. That's what -BEGIN RSA PUBLIC KEY-
indicates. However, M2Crypto.RSA.load_pub_key expects the key in X.509
format, which starts with -BEGIN PUBLIC KEY- and also has a
different format inside, so just changing the header and trailer won't
work.
Anyway, I doubt that the key is correct as it seems to large for just a
public key. How was that key generated?
--
Piet van Oostrum p...@cs.uu.nl
URL: http://pietvanoostrum.com [PGP 8DAE142BE17999C4]
Private email: p...@vanoostrum.org
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Re: Substitute for KConfig in Qt4
On Sat Sep 19 12:18:40 CEST 2009, nusch wrote: On Sep 19, 3:53 am, David Boddie da... at boddie.org.uk wrote: On Thursday 17 September 2009 13:04, nusch wrote: I want to remove pyKDE dependencies from my app to make it pure PyQt. What will be the best substitute for KConfig? What exactly do you use KConfig for in your application? David e.g storing dock window positions, fields choosen in QComboBox etc. But I Dont want to use normal config files for it Then you would use QSettings. Although that may use configuration files behind the scenes, they should at least be stored in a standard place. http://www.riverbankcomputing.com/static/Docs/PyQt4/html/qsettings.html David -- http://mail.python.org/mailman/listinfo/python-list
Re: Combining sets/dictionaries
On Sep 22, 3:08 am, Alfons Nonell-Canals alfons.non...@upf.edu wrote: Hello, I have different sets/dictionaries/lists (whatever you want because I can convert them easily) and I would like to combine them. I don't want a consensus and something like it. I'd need to combine all elements of the first one with the all elements of the second one and third,... the numbers of dictionaries/sets/lists is variable as the number of elements for each one. For example, i have the following sets and I would like to obtain all possible combinations... ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] This is the input. What do you want the output to look like given this input? I can't really tell exactly what you mean by all combinations, there are different ways to combine sequences, and it doesn't sound like you mean the formal mathematical definition of combination. My best guess is that you want something like this. def all_union(seqs): s = set() for seq in seqs: s.update(seq) return s Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
http://codingforums.com/showthread.php?s=e26b8b0aabc69745ef24a855b1a0fc83t=177529 It seems that this dude really is looking for how to double a variable... hi looking for help catching up in a class and overall to get me better than i am now. I can pay you by the week or per hour. everything can be done by email i will ask you questions and send you simple questions like: how to double a variables value i.e: def double(x): return (x * 2) ect. you can post here or send me an email at ***...@aol.com On Tue, Sep 22, 2009 at 9:01 AM, Mel mwil...@the-wire.com wrote: Tim Roberts wrote: daggerdvm dagger...@yahoo.com wrote: carl banks.you are a dork What are you, eleven years old? Look, you asked us to answer for you what is CLEARLY a homework question. It is unethical for you to ask that, and it is unethical for us to answer it. Forget ethical. We can do his homework for him, we can perhaps pass exams for him, maybe graduate for him, and then with our luck, he'll get a job in our office and we get to do his work for him. Mel. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On 2009-09-22, Mel mwil...@the-wire.com wrote: Tim Roberts wrote: daggerdvm dagger...@yahoo.com wrote: carl banks.you are a dork What are you, eleven years old? Look, you asked us to answer for you what is CLEARLY a homework question. It is unethical for you to ask that, and it is unethical for us to answer it. Forget ethical. We can do his homework for him, we can perhaps pass exams for him, maybe graduate for him, and then with our luck, he'll get a job in our office and we get to do his work for him. No, no, no. The plan is to do his homework for him so that he's incompetent when he graduates and won't be competition for the rest of us who did do our homework. -- Grant Edwards grante Yow! ... the HIGHWAY is at made out of LIME JELLO and visi.commy HONDA is a barbequeued OYSTER! Yum! -- http://mail.python.org/mailman/listinfo/python-list
Re: Combining sets/dictionaries
Hello, finally I've solved it using a combinatorics library which allows to do this kind of things. Here, here is an example: http://automatthias.wordpress.com/2007/04/28/cartesian-product-of-multiple-sets/ Thanks for your suggestions. Regards, Alfons. Carl Banks wrote: On Sep 22, 3:08 am, Alfons Nonell-Canals alfons.non...@upf.edu wrote: Hello, I have different sets/dictionaries/lists (whatever you want because I can convert them easily) and I would like to combine them. I don't want a consensus and something like it. I'd need to combine all elements of the first one with the all elements of the second one and third,... the numbers of dictionaries/sets/lists is variable as the number of elements for each one. For example, i have the following sets and I would like to obtain all possible combinations... ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['I', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['I', 'O', 'N', 'P', 'S', 'C'] ['F', 'I', 'L', 'O', 'N', 'P', 'S', 'R', 'C'] This is the input. What do you want the output to look like given this input? I can't really tell exactly what you mean by all combinations, there are different ways to combine sequences, and it doesn't sound like you mean the formal mathematical definition of combination. My best guess is that you want something like this. def all_union(seqs): s = set() for seq in seqs: s.update(seq) return s Carl Banks -- Alfons Nonell-Canals, PhD Chemogenomics Lab Research Group on Biomedical Informatics (GRIB) - IMIM/UPF Barcelona Biomedical Research Park (PRBB) C/ Doctor Aiguader, 88 - 08003 Barcelona alfons.non...@upf.edu - http://cgl.imim.es Tel. +34933160528 http://alfons.elmeuportal.cat http://www.selenocisteina.info -- http://mail.python.org/mailman/listinfo/python-list
Re: Finding application data after install - a solution?
In article mailman.232.1253597842.2807.python-l...@python.org, Wolodja Wentland wentl...@cl.uni-heidelberg.de wrote: I want to: 1. Give administrators the freedom to install the data wherever they want 2. Adhere to the FHS (installing data within modules breaks it) 3. Be able to find that data again regardless of the installation scheme used 1 and 2 are easily solved... It was just not possible to find the data again. The snippet in the original code solves that. Given your mention of FHS, it sounds like you are focused on Unix-like systems, in which case why not rely on the standard mechanisms for config files? -- Aahz (a...@pythoncraft.com) * http://www.pythoncraft.com/ I won't accept a model of the universe in which free will, omniscient gods, and atheism are simultaneously true. --M -- http://mail.python.org/mailman/listinfo/python-list
Dynamic Form
Hi; I have a dynamic form in which I do the following: 1) Request two fields (company name, number of entries). That is sent back to the form. 2) If the two fields are not None, the form requests other data. That, too, is sent back to the form. 3) That new data is then entered into a MySQL table. The problem is, that when I go back to refresh the form, the data is re-entered into the table! How do I prevent that? TIA, Victor -- http://mail.python.org/mailman/listinfo/python-list
Re: OK to memoize re objects?
On Sep 21, 11:02 am, Nobody nob...@nowhere.com wrote: On Mon, 21 Sep 2009 07:11:36 -0700, Ethan Furman wrote: Looking in the code for re in 2.5: _MAXCACHE = 100 On the other hand, I (a re novice, to be sure) have only used between two to five in any one program... it'll be a while before I hit _MAXCACHE! Do you know how many REs import-ed modules are using? The cache isn't reserved for __main__. Based on this, I'd say that the best policy would be that if you only have a handful of simple REs that are used only on occasion, it's probably not worth using re.compile--even if they fall out of cache, it shouldn't take a noticeable amount of time to recompile them. If, however, these are either complex REs, or REs that are being used very frequently, say in a loop, might as well save the compiled RE somewhere just to be sure it doesn't have to be recompiled at any point. -- http://mail.python.org/mailman/listinfo/python-list
Re: easy question, how to double a variable
On Sep 22, 9:57 am, Grant Edwards inva...@invalid.invalid wrote: On 2009-09-22, Mel mwil...@the-wire.com wrote: Tim Roberts wrote: daggerdvm dagger...@yahoo.com wrote: carl banks.you are a dork What are you, eleven years old? Look, you asked us to answer for you what is CLEARLY a homework question. It is unethical for you to ask that, and it is unethical for us to answer it. Forget ethical. We can do his homework for him, we can perhaps pass exams for him, maybe graduate for him, and then with our luck, he'll get a job in our office and we get to do his work for him. No, no, no. The plan is to do his homework for him so that he's incompetent when he graduates and won't be competition for the rest of us who did do our homework. Well, while they may not be as much competition come promotion time, I think Mr. Finney had it right that these people *do* still somehow get hired, and then the rest of us end up having to do enough work for multiple people. Sometimes spending more time redoing other peoples' shoddy work than it would have taken to do ourselves in the first place. Annoying for the programmer, but really bad for business. -- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic Form
On Tue, Sep 22, 2009 at 10:46 AM, Victor Subervi victorsube...@gmail.com wrote: Hi; I have a dynamic form in which I do the following: 1) Request two fields (company name, number of entries). That is sent back to the form. 2) If the two fields are not None, the form requests other data. That, too, is sent back to the form. 3) That new data is then entered into a MySQL table. The problem is, that when I go back to refresh the form, the data is re-entered into the table! How do I prevent that? TIA, Victor First, this seems like it's not a python question, rather it's seems to be about some web stuff. Second, there's not enough information to tell you anything useful. -- http://mail.python.org/mailman/listinfo/python-list
Re: Dynamic Form--Potential purge cache?
Personally that sounds like the data needs to be deliberately oveerittren in the form. That or the cache has to be cleared by a remote instruction. Unfortunately I know how to do neither :[ --Original Message-- From: Simon Forman sajmik...@gmail.com To: python-list@python.org Date: Tue, 22 Sep 2009 11:34:25 AM -0400 Subject: Re: Dynamic Form On Tue, Sep 22, 2009 at 10:46 AM, Victor Subervi victorsube...@gmail.com wrote: Hi; I have a dynamic form in which I do the following: 1) Request two fields (company name, number of entries). That is sent back to the form. 2) If the two fields are not None, the form requests other data. That, too, is sent back to the form. 3) That new data is then entered into a MySQL table. The problem is, that when I go back to refresh the form, the data is re-entered into the table! How do I prevent that? TIA, Victor First, this seems like it's not a python question, rather it's seems to be about some web stuff. Second, there's not enough information to tell you anything useful. -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Module inspection by name
Hi all, a have easy question for python developers. Assume I have list of all objects: obj=dir() Now I want to know which object from obj list is module. I searched some method in module inspection, but there is not any method that get 'string' as parameters Any reply will be greatfull Nadav -- http://mail.python.org/mailman/listinfo/python-list
Re: Module inspection by name
Nadav Chernin wrote: Hi all, a have easy question for python developers. Assume I have list of all objects: obj=dir() Now I want to know which object from “obj” list is module. I searched some method in module inspection, but there is not any method that get ‘string’ as parameters Any reply will be greatfull Nadav import sys import os name = 'os' sys.modules[name] will return the module itself with the string name. It should allow you to use the method you found using the module itself. JM -- http://mail.python.org/mailman/listinfo/python-list
Re: Finding application data after install - a solution?
On Tue, Sep 22, 2009 at 07:42 -0700, Aahz wrote:
I want to:
1. Give administrators the freedom to install the data wherever they
want
2. Adhere to the FHS (installing data within modules breaks it)
3. Be able to find that data again regardless of the installation
scheme used
1 and 2 are easily solved... It was just not possible to find the data
again. The snippet in the original code solves that.
Given your mention of FHS, it sounds like you are focused on Unix-like
systems, in which case why not rely on the standard mechanisms for config
files?
I do not intentionally focus on UNIX type systems, but I have grown up
with *nix and I rather follow one scheme than none at all. But the
proposed way works on Windows as well, although the users might find
previously unseen directories like 'PREFIX/share/foo/doc' and the like
on their system.
How to solve this platform independently? And what standard mechanisms
for config files do you mean? Are there library functions I overlooked?
But the data I am speaking about are not config files. I will explain in
more detail so you can understand the problem.
I have a library that parses markup that has a canonical form and a
localised one. 'Image:' for example is the canonical form and the one
used for English. In German the canonical form *and* a localised one is
used ('Bild:'). This scheme (localised+canonical) holds true for all
(260+) languages this markup is used in.
The library itself works fine with the canonical forms, but loads
language specific markup definitions *if they are available* . I
therefore don't want to install this data along with the library for the
following reasons:
1. The data is not needed if the user just want to work with English
data
2. The data could change much more frequently than the library that
works with the data.
If I couple library and data together I would have to make a new
release *every time* the data changes, even if the user does not
care about the other languages.
I therefore opted to provide a seperate (Python) distribution foo-data
which contains the language specific markup definitions and install it
to '$DATA_PREFIX/share/foo/languageinfo' .
As $DATA_PREFIX is only known at build time there was (until now) no
reliable way to find the data if the only information one can get is
$LIB_PREFIX, because these two might be totally unrelated.
I hope that clarifies my point
Wolodja
P.S Which markup format am I speaking about? First one to answer gets a
brand new Internet!
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Re: entry widget won't validate
On Sep 22, 4:29 am, Peter Otten __pete...@web.de wrote:
Mike wrote:
On Sep 21, 12:47 pm, Peter Otten __pete...@web.de wrote:
Mike wrote:
I'm trying to arrange for an Entry widget to check whether its data
is all digits and whether the number represented is small enough.
The validate function seem to be called once at startup and not
afterwards:
The print statement run 3 times at startup.
Editing an Entry does not cause any printing.
Any ideas?
I don't know Tcl either; the following is the first thing that seemed to
work, after some trial and error:
import Tkinter as tk
def validate(before, after):
print before, --, after
return after.isdigit()
if __name__ == __main__:
root = tk.Tk()
name = root.register(validate)
cmd = 'expr {[%(name)s %(parms)s]}' % dict(name=name, parms=%s %P)
var = tk.StringVar()
entry = tk.Entry(root, textvariable=var,
validate=all, validatecommand=cmd)
entry.pack()
entry.focus_set()
root.mainloop()
Thanks.
It worked.
I discovered that None is not an acceptable substitute for False.
If validate returns None, it quits being called.
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Re: Dynamic Form
Well it's Web stuff, sure, but it's written in python :) The code follows.
The problem is that I haven't figured out how to tell the program that the
user has entered data and to clear the cache of that data so that it's not
re-entered. How do I do that?
TIA,
Victor
#!/usr/bin/python
import cgitb; cgitb.enable()
import cgi
import sys,os
sys.path.append(os.getcwd())
import MySQLdb
import re
def upload(company, num):
form = cgi.FieldStorage()
num = form.getfirst('num', 0)
company = form.getfirst('company', '')
flag = form.getfirst('flag', '')
num = int(num)
print Content-Type: text/html
print
print
!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Frameset//EN
http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd;
head xmlns=http://www.w3.org/1999/xhtml;
style type='text/css'
.text { font-family: Arial, Helvetica, sans-serif; font-size: 16px;
text-decoration: none; text-align: justify}
/style
titleGlobal Solutions Group/title
meta http-equiv=distribution content=Global /
meta http-equiv=robots content=index all, follow all /
meta name=author content=This web site developed by beno. You may reach
him at his web site [beno.vi], or by dialing 340-773-0687 and asking for
room 102. /
body
if flag == 'yes':
host = 'hose'
db = 'db'
user = 'user'
passwd = 'pass'
database = MySQLdb.connect(host, user, passwd, db)
cursor= database.cursor()
pat = '[.,()\[\]\\+=!#$%^;:\'*]'
company = re.sub(pat, '', company)
sql = 'Category varchar(100), Item varchar(20), Description
varchar(255), UOM varchar(20), Price float(7,2)'
cursor.execute('create table if not exists %s (%s);' % (company, sql))
i = 0
while i num:
print i
cat = 'cat' + str(i)
cat = form.getfirst(cat, '')
item = 'item' + str(i)
item = form.getfirst(item, '')
descr = 'descr' + str(i)
descr = form.getfirst(descr, '')
uom = 'uom' + str(i)
uom = form.getfirst(uom, '')
price = 'price' + str(i)
price = form.getfirst(price, '')
sql = 'insert into %s (Category, Item, Description, UOM, Price) values
(%s, %s, %s, %s, %s);' % (company, cat, item, descr, uom, price)
cursor.execute(sql)
i += 1
cursor.close()
print 'h2Data entered successfully./h2'
company = ''
num = 0
print 'form method=post action=upload.py\n'
print Company Name: input type='text' value='%s' size='20'
maxlength='100' name='company' /br /br /\n % (company)
if num == 0:
print How many rows of products shall we include? input type='text'
value='' size='10' maxlength='10' name='num' /br /\n
else:
print input type='hidden' name='flag' value='yes' /\n
print input type='hidden' name='num' value='%s' /\n % (num)
i = 0
while i num:
print 'hr /\n'
print Category: input type='text' value='' size='20' maxlength='100'
name='cat%s' /br /\n % (str(i))
print Item: input type='text' value='' size='20' maxlength='20'
name='item%s' /br /\n % (str(i))
print Description: input type='text' value='' size='20'
maxlength='255' name='descr%s' /br /\n % (str(i))
print UOM: input type='text' value='' size='20' maxlength='20'
name='uom%s' /br /\n % (str(i))
print Price: input type='text' value='' size='10' maxlength='10'
name='price%s' /br /\n % (str(i))
i += 1
print
hr /
div align='center'
input type='submit' value=' Send ' /
/div
/form
/body/html
upload(company='', num=0)
On Tue, Sep 22, 2009 at 11:34 AM, Simon Forman sajmik...@gmail.com wrote:
On Tue, Sep 22, 2009 at 10:46 AM, Victor Subervi
victorsube...@gmail.com wrote:
Hi;
I have a dynamic form in which I do the following:
1) Request two fields (company name, number of entries). That is sent
back
to the form.
2) If the two fields are not None, the form requests other data. That,
too,
is sent back to the form.
3) That new data is then entered into a MySQL table.
The problem is, that when I go back to refresh the form, the data is
re-entered into the table! How do I prevent that?
TIA,
Victor
First, this seems like it's not a python question, rather it's seems
to be about some web stuff.
Second, there's not enough information to tell you anything useful.
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Set literal confusion
I recently decided to implement a small project in python after being
away from the language for a while, so, in learning the language over
again, I experimented.
---
Python 3.1.1 (r311:74483, Aug 17 2009, 16:45:59) [MSC v.1500 64 bit
(AMD64)] on win32
5 in set(range(10))
True
15 in set(range(10))
False
5 in {range(10)}
False
15 in {range(10)}
False
{range(10)}
{range(0, 10)}
set(range(10))
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
--
After a few days of sitting on what seemed at first to be seemingly
buggy, inconsistent set-creation behaviour, I've finally decided it's
not a bug, but a misunderstanding of mine. However, that does still
leave me with one question: why does Python 3.1.1 allow me to get
caught up in my confusion while Python 3.0 (an EARLIER version) spouts
an error pointing me in the right direction? (see below for Python 3.0
behaviour)
Python 3.0 (r30:67507, Dec 3 2008, 20:14:27) [MSC v.1500 32 bit
(Intel)] on win32
5 in set(range(10))
True
15 in set(range(10))
False
5 in {range(10)}
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: unhashable type: 'range'
15 in {range(10)}
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: unhashable type: 'range'
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Re: easy question, how to double a variable
On Tue, Sep 22, 2009 at 11:58 PM, Mahmoud Abdelkader mabdelka...@gmail.comwrote: hi looking for help catching up in a class and overall to get me better than i am now. I can pay you by the week or per hour. Wow. I'd feel guilty getting paid doing that. Sounds all too easy. I hope he is actually learning, not just thinking that money will solve all his problems. Cheers, Xav -- http://mail.python.org/mailman/listinfo/python-list
Re: Not this one the other one, from a dictionary
Building on the answers of the others, a simple one liner, no side
effect, not the fastest I guess:
d={'a': 'bob', 'b': 'stu'}
set( d.keys() ).difference( [ 'a' ] ).pop()
'b'
Note the square brackets for the parameter of difference(). 'The
string 'a' and the list [ 'a' ] are both iterable but really are
different.
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Re: Set literal confusion
kaoruAngel wrote:
I recently decided to implement a small project in python after being
away from the language for a while, so, in learning the language over
again, I experimented.
---
Python 3.1.1 (r311:74483, Aug 17 2009, 16:45:59) [MSC v.1500 64 bit
(AMD64)] on win32
5 in set(range(10))
True
15 in set(range(10))
False
5 in {range(10)}
False
15 in {range(10)}
False
{range(10)}
{range(0, 10)}
set(range(10))
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
--
After a few days of sitting on what seemed at first to be seemingly
buggy, inconsistent set-creation behaviour, I've finally decided it's
not a bug, but a misunderstanding of mine. However, that does still
leave me with one question: why does Python 3.1.1 allow me to get
caught up in my confusion while Python 3.0 (an EARLIER version) spouts
an error pointing me in the right direction? (see below for Python 3.0
behaviour)
That is probably a bug: http://bugs.python.org/issue4701
Python 3.0 (r30:67507, Dec 3 2008, 20:14:27) [MSC v.1500 32 bit
(Intel)] on win32
5 in set(range(10))
True
15 in set(range(10))
False
5 in {range(10)}
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: unhashable type: 'range'
15 in {range(10)}
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: unhashable type: 'range'
My younger 3.0.1 doesn't show that behaviour:
Python 3.0.1+ (r301:69556, Apr 15 2009, 17:25:52)
[GCC 4.3.3] on linux2
Type help, copyright, credits or license for more information.
{range(10)}
{range(0, 10)}
Peter
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Re: Set literal confusion
2009/9/22 kaoruAngel kaoruan...@gmail.com:
I recently decided to implement a small project in python after being
away from the language for a while, so, in learning the language over
again, I experimented.
---
Python 3.1.1 (r311:74483, Aug 17 2009, 16:45:59) [MSC v.1500 64 bit
(AMD64)] on win32
5 in set(range(10))
True
15 in set(range(10))
False
5 in {range(10)}
False
15 in {range(10)}
False
{range(10)}
{range(0, 10)}
set(range(10))
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
--
...
You might also try the set comprehension:
Python 3.1 (r31:73574, Jun 26 2009, 20:21:35) [MSC v.1500 32 bit
(Intel)] on win32
Type copyright, credits or license() for more information.
{i for i in range(10)}
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
set(range(10))
{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
For these simple cases without conditions, it probably doesn't make
much difference.
The character of the single items is maybe more obvious.
vbr
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Re: Set literal confusion
Dennis Lee Bieber wrote:
range() is what used to be xrange() -- an on-demand generator of
values. You created a set containing a single generator. Try something
like:
5 in {list(range(10))}
No. {expr} is always a set with a single element.
{range(10)}
{range(0, 10)}
That element cannot be a list, by the way, because lists aren't hashable.
{list(range(10))}
Traceback (most recent call last):
File stdin, line 1, in module
TypeError: unhashable type: 'list'
Peter
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How can I tell if variable is defined
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
I tried if var is not None:
However this doesn't seem to work as described.
Thanks.
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Re: How can I tell if variable is defined
On Sep 22, 11:03 am, Brown, Rodrick rodrick.br...@citi.com wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
I tried if var is not None:
However this doesn't seem to work as described.
Thanks.
try:
var
except NameError:
handle_it()
~Sean
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Re: How can I tell if variable is defined
On Tue, 22 Sep 2009 11:03:25 -0700, Brown, Rodrick
rodrick.br...@citi.com wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
I tried if var is not None:
However this doesn't seem to work as described.
Thanks.
Could you let us know in what context you're checking to see if a variable
is defined? If you mean has the name been used before, then bear in mind
Python is a lot stricter about this kind of thing than Perl, and if you've
never used 'var' before the if-statement, you'll probably get a NameError
being raised.
If you want to check whether the name 'var' is bound to a meaningful
object, however (e.g. if it's an optional argument to a function, and you
know it exists, but don't know if it's bound to meaningful data) then your
construction should work.
--
Rami Chowdhury
Never attribute to malice that which can be attributed to stupidity --
Hanlon's Razor
408-597-7068 (US) / 07875-841-046 (UK) / 0189-245544 (BD)
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Re: How can I tell if variable is defined
On 2009-09-22, Brown, Rodrick rodrick.br...@citi.com wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
try:
yourNameHere
except NameError:
print undefined
else:
print defined
I tried if var is not None:
However this doesn't seem to work as described.
As described where?
--
Grant Edwards grante Yow! I feel like a wet
at parking meter on Darvon!
visi.com
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Re: Substitute for KConfig in Qt4
On Sep 22, 3:43 pm, David Boddie dbod...@trolltech.com wrote: On Sat Sep 19 12:18:40 CEST 2009, nusch wrote: On Sep 19, 3:53 am, David Boddie da... at boddie.org.uk wrote: On Thursday 17 September 2009 13:04, nusch wrote: I want to remove pyKDE dependencies from my app to make it pure PyQt. What will be the best substitute for KConfig? What exactly do you use KConfig for in your application? David e.g storing dock window positions, fields choosen in QComboBox etc. But I Dont want to use normal config files for it Then you would use QSettings. Although that may use configuration files behind the scenes, they should at least be stored in a standard place. http://www.riverbankcomputing.com/static/Docs/PyQt4/html/qsettings.html David Thanks. That's what I'm looking for -- http://mail.python.org/mailman/listinfo/python-list
Re: Module inspection by name
Jean-Michel Pichavant wrote: div class=moz-text-flowed style=font-family: -moz-fixedNadav Chernin wrote: Hi all, a have easy question for python developers. Assume I have list of all objects: obj=dir() Now I want to know which object from “obj” list is module. I searched some method in module inspection, but there is not any method that get ‘string’ as parameters Any reply will be greatfull Nadav import sys import os name = 'os' sys.modules[name] will return the module itself with the string name. It should allow you to use the method you found using the module itself. JM /div The right way to tell if an object is a module is to do isinstance(). But your first problem is that the return value of dir() is a list of strings, while you want a list of objects. I'd suggest you use globals() instead, which produces a dictionary of name/object pairs. Then iterate through the values, checking each type with isinstance(). Show us a sample of your code that doesn't work, and we'll try to show you how to fix it. DaveA -- http://mail.python.org/mailman/listinfo/python-list
custom data warehouse in python vs. out-of-the-box ETL tool
Does anyone have experience building a data warehouse in python? Any thoughts on custom vs using an out-of-the-box product like Talend or Informatica? I have an integrated system Dashboard project that I was going to build using cross-vendor joins on existing DBs, but I keep hearing that a data warehouse is the way to go. e.g. I want to create orders and order_items with relations to members (MS Access DB), products (flat file) and employees (MySQL). Thanks in advance for any tips. -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I tell if variable is defined
Brown, Rodrick wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
I tried if var is not None:
However this doesn't seem to work as described.
Thanks.
try/except
Or look up the attribute in the appropriate dictionary(ies).
def test():
newvar = 42
if newvar in locals():
print yes
DaveA
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Re: How can I tell if variable is defined
Grant Edwards wrote:
On 2009-09-22, Brown, Rodrick rodrick.br...@citi.com wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
try:
yourNameHere
except NameError:
print undefined
else:
print defined
This being Python, however, it can be fooled:
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type help, copyright, credits or license for more information.
class A():
... def __repr__ (self):
... global b
... return b
...
a = A()
try:
... a
... except NameError:
... print `a` is not defined
...
`a` is not defined
Mel.
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Read header and data from a binary file
Hello,
I want to read from a binary file called myaudio.dat
Then I've tried the next code:
import struct
name = myaudio.dat
f = open(name,'rb')
f.seek(0)
chain = 4s 4s I 4s I 20s I I i 4s I 67s s 4s I
s = f.read(4*1+4*1+4*1+4*1+4*1+20*1+4*1+4*1+4*1+4*1+4*1+67*1+1+4*1+4*1)
a = struct.unpack(chain, s)
header = {'identifier' : a[0],
'cid' : a[1],
'clength' : a[2],
'hident' : a[3],
'hcid32' : a[4],
'hdate' : a[5],
'sampling' : a[6],
'length_B' : a[7],
'max_cA' : a[8],
'max_cA1' : a[9],
'identNOTE' : a[10],
'c2len' : a[11],}
It produces:
{'length_B': 150001, 'sampling': 5, 'max_cA1': 'NOTE', 'hident': 'HEDR',
'c2len': Normal Sustained Vowel 'A', Voice and Speech Lab., MEEI, Boston,
MA, 'hdate': 'Jul 13 11:57:41 1994', 'identNOTE': 68, 'max_cA': -44076,
'cid': 'DS16', 'hcid32': 32, 'identifier': 'FORM', 'clength': 300126}
So far when I run f.tell()
f.tell()
136L
The audio data length is 300126, now I need a clue to build an array with
the audio data (The Chunk SDA_), would it possible with struct?, any help ?
Thanks
The file format is:
Offset | Length | Type |Contents
0 4character Identifier: FORM
4 4character Chunk identifier: DS16
8 4integer Chunk length
12 - - Chunk data
Header 2
Offset Length Type Contents
0 4 character Identifier: HEDR or HDR8
4 4 integer Chunk length (32)
8 20 character Date, e.g. May 26 23:57:43 1995
28 4 integer Sampling rate
32 4 integer Data length (bytes)
36 2 unsigned integer Maximum absolute value for channel A:
0x if not defined
38 2 unsigned integer Maximum absolute value for channel A:
0x if not defined
NOTE Chunk
Offset Length Type Contents
0 4 character Identifier: NOTE
4 4 integer Chunk length
8 - character Comment string
SDA_, SD_A or SDAB Chunk
Offset Length Type Contents
0 4 character Identifier: SDA_, SD_B, or SDAB
4 4 integer Chunk length
8 - - Data
--
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Re: How can I tell if variable is defined
Brown, Rodrick wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
I tried if var is not None:
However this doesn't seem to work as described.
But in Python this often is the most idiomatic way to check whether a
variable was set explicitly. Example:
def foo(a=None):
... if a is None:
... print using default
... else:
... print using a =, a
...
foo()
using default
foo(42)
using a = 42
If you tell us what you are actually trying to do we can probably come up
with a solution that is better than the literal answer
try:
a
except NameError:
a_is_defined = False
else:
a_is_defined = True
Peter
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set breakpoint in another module/file
Is there a way with pdb to set a breakpoint in another module directly using a command similar to set_trace() ? For example, I'd like to do something like this in my source code: import pdb pdb.setbreak(42, /path/to/universe.py, name == 'hitchhiker') Is there a way to do (something like) that with the pdb that ships with Python? If not, what would people think of adding an additional function to the pdb module that would do something like the following code (see below). My use case for this is that often I'd like to set a breakpoint in some module that does not belong to the project I'm working in. I rather not edit the module, which is often in site- packages. The workaround of course is to use set_trace() to drop into pdb and then set the breakpoint at the pdb prompt, but that's clumsy. I've found this to be handy: def setbreak(line=None, file=None, cond=None, temp=0, frame=None, throw=False): set a breakpoint or a given line in file with conditional arguments: line - line number on which to break file - module or filename where the breakpoint should be set cond - string with conditional expression, which (if given) must evaluate to true to break temp - if true, create a temporary breakpoint example usage: setbreak(42, /path/to/universe.py, name == 'hitchhiker') if frame is None: frame = sys._getframe().f_back if file is None: file = frame.f_code.co_filename elif not file.startswith(file:) and os.path.sep not in file: try: mod = __import__(file[4:], globals(), locals(), [__file__]) except ImportError, err: if throw: raise sys.__stdout__.write(cannot set breakpoint: %s:%s : %s % (file, line, err)) return file = mod.__file__ sys.__stdout__.write(breaking in: %s % file) if file.endswith(.pyc): file = file[:-1] pdb = Pdb(stdout=sys.__stdout__) # use sys.__stdout__ to work with nose tests pdb.reset() pdb.curframe = frame pdb.botframe = object() pdb.set_continue() temp = line while temp line + 10: error = pdb.set_break(file, temp, cond=cond, temporary=temp) if error: temp += 1 else: break if error: error = pdb.set_break(file, line, cond=cond, temporary=temp) if throw: raise Error(error) sys.__stdout__.write(\n%s\n % error) return sys.__stdout__.write(\n) pdb.do_break() # print breakpoints sys.settrace(pdb.trace_dispatch) I'm sure there is a better way to implement some of this, especially the part marked with HACK, but it seems to work for me in most situations. ~ Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I tell if variable is defined
Mel wrote:
Grant Edwards wrote:
On 2009-09-22, Brown, Rodrick rodrick.br...@citi.com wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
try:
yourNameHere
except NameError:
print undefined
else:
print defined
This being Python, however, it can be fooled:
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type help, copyright, credits or license for more information.
class A():
... def __repr__ (self):
... global b
Superfluous global statement.
... return b
...
a = A()
try:
... a
... except NameError:
... print `a` is not defined
...
`a` is not defined
This is an artifact of the interactive interpreter, like the following way
to print 42:
for i in range(3): 42
...
42
42
42
Peter
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Re: set breakpoint in another module/file
Daniel wrote: Is there a way with pdb to set a breakpoint in another module directly using a command similar to set_trace() ? For example, I'd like to do something like this in my source code: import pdb pdb.setbreak(42, /path/to/universe.py, name == 'hitchhiker') I think winpdb ( nothing todo with windows-OS ) can do that and much more. cheers, Stef -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I tell if variable is defined
Peter Otten wrote:
Mel wrote:
Grant Edwards wrote:
On 2009-09-22, Brown, Rodrick rodrick.br...@citi.com wrote:
How could I do the following check in Python
In Perl I could do something like if ((defined($a)) { ... }
[ ... ]
This is an artifact of the interactive interpreter,
True. You can avoid the artifact by wrapping the test in a function:
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type help, copyright, credits or license for more information.
class A():
... def __repr__ (self):
... return b
...
def is_defined (obj):
... try:
... obj
... except NameError:
... return False
... return True
...
a = A()
if is_defined (a):
... print `a` is defined
... else:
... print `a` is not defined
...
`a` is defined
if is_defined (b):
... print `b` is defined
... else:
... print `b` is not defined
...
Traceback (most recent call last):
File stdin, line 1, in module
NameError: name 'b' is not defined
At the cost of it not quite working when the function is called with an
undefined name. I suppose the print statements could be crafted to make it
look better.
Mel.
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DBHandler class for logging?
I've come across mentions of a mythical class of logging handlers called DBHandler, but I can't find it anywhere. Could someone please point me in the right direction? (FWIW, I'm looking for ways to log messages to PostgreSQL RDBMS.) TIA! kynn -- http://mail.python.org/mailman/listinfo/python-list
Re: DBHandler class for logging?
kj schrieb: I've come across mentions of a mythical class of logging handlers called DBHandler, but I can't find it anywhere. Could someone please point me in the right direction? (FWIW, I'm looking for ways to log messages to PostgreSQL RDBMS.) I'm not aware such a thing is part of the standard logging package. But it's trivial to write one, we did so ourselves. Depending on your version of python, you need to inject the class into the logging.handlers-module to make it loadable by the logfile-format. AFAIK since 2.6 that restriction is gone. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: DBHandler class for logging?
In 7hsukcf2tqht...@mid.uni-berlin.de Diez B. Roggisch de...@nospam.web.de writes: kj schrieb: I've come across mentions of a mythical class of logging handlers called DBHandler, but I can't find it anywhere. Could someone please point me in the right direction? (FWIW, I'm looking for ways to log messages to PostgreSQL RDBMS.) I'm not aware such a thing is part of the standard logging package. But it's trivial to write one, we did so ourselves. Depending on your version of python, you need to inject the class into the logging.handlers-module to make it loadable by the logfile-format. I'm sorry for my ignorance, but what exactly do you mean by injecting the new class into the logging.handlers-module? And what is the logfile-format? TIA! kynn -- http://mail.python.org/mailman/listinfo/python-list
Searching a large dictionary
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
What would be the best way to search for a specific value of item1 and add
all the results to a new dictionary? Thanks
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Re: custom data warehouse in python vs. out-of-the-box ETL tool
On Sep 22, 1:00 pm, snfctech tschm...@sacfoodcoop.com wrote: Does anyone have experience building a data warehouse in python? Any thoughts on custom vs using an out-of-the-box product like Talend or Informatica? I have an integrated system Dashboard project that I was going to build using cross-vendor joins on existing DBs, but I keep hearing that a data warehouse is the way to go. e.g. I want to create orders and order_items with relations to members (MS Access DB), products (flat file) and employees (MySQL). Thanks in advance for any tips. I have done some small/medium sized stuff using SQLAlchemy, Turbogears, and Flex. I have never used a commercial product, but I imagine getting it set up to work with your data is the hardest part of the job anyway, and the solution you end up with will most likely limit you to applying their api to your data. If you build it yourself, you have complete control, and know exactly where to go when you have a problem, or to add a feature. I'm no expert, but I think I would try to find a way to consolidate the data into one data source. We handle the giant amount of data we are collecting by preprocessing it into another DB anyway, so I imagine you could do both things at the same time. This could very probably be handled in a different way if you are a DBA. I'm just a MySQL hack. :) ~Sean -- http://mail.python.org/mailman/listinfo/python-list
Re: Read header and data from a binary file
On Tue, Sep 22, 2009 at 4:30 PM, Jose Rafael Pacheco
jose_rafael_pach...@yahoo.es wrote:
Hello,
I want to read from a binary file called myaudio.dat
Then I've tried the next code:
import struct
name = myaudio.dat
f = open(name,'rb')
f.seek(0)
Don't bother to seek(0) on a file you just opened.
chain = 4s 4s I 4s I 20s I I i 4s I 67s s 4s I
s = f.read(4*1+4*1+4*1+4*1+4*1+20*1+4*1+4*1+4*1+4*1+4*1+67*1+1+4*1+4*1)
Instead of calculating the size of the data represented by the format,
instead use the struct.calcsize() function
s = f.read(struct.calcsize(chain))
a = struct.unpack(chain, s)
header = {'identifier' : a[0],
'cid' : a[1],
'clength' : a[2],
'hident' : a[3],
'hcid32' : a[4],
'hdate' : a[5],
'sampling' : a[6],
'length_B' : a[7],
'max_cA' : a[8],
'max_cA1' : a[9],
'identNOTE' : a[10],
'c2len' : a[11],}
It produces:
{'length_B': 150001, 'sampling': 5, 'max_cA1': 'NOTE', 'hident': 'HEDR',
'c2len': Normal Sustained Vowel 'A', Voice and Speech Lab., MEEI, Boston,
MA, 'hdate': 'Jul 13 11:57:41 1994', 'identNOTE': 68, 'max_cA': -44076,
'cid': 'DS16', 'hcid32': 32, 'identifier': 'FORM', 'clength': 300126}
So far when I run f.tell()
f.tell()
136L
The audio data length is 300126, now I need a clue to build an array with
the audio data (The Chunk SDA_), would it possible with struct?, any help ?
Read the chunk ID and length and then use the length to read the rest
of the chunk data.
Thanks
The file format is:
Offset | Length | Type | Contents
0 4 character Identifier: FORM
4 4 character Chunk identifier: DS16
8 4 integer Chunk length
12 - - Chunk data
Header 2
Offset Length Type Contents
0 4 character Identifier: HEDR or HDR8
4 4 integer Chunk length (32)
8 20 character Date, e.g. May 26 23:57:43 1995
28 4 integer Sampling rate
32 4 integer Data length (bytes)
36 2 unsigned integer Maximum absolute value for channel A:
0x if not defined
38 2 unsigned integer Maximum absolute value for channel A:
0x if not defined
NOTE Chunk
Offset Length Type Contents
0 4 character Identifier: NOTE
4 4 integer Chunk length
8 - character Comment string
SDA_, SD_A or SDAB Chunk
Offset Length Type Contents
0 4 character Identifier: SDA_, SD_B, or SDAB
4 4 integer Chunk length
8 - - Data
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Re: Read header and data from a binary file
Jose Rafael Pacheco wrote: Hello, I want to read from a binary file called myaudio.dat Then I've tried the next code: import struct name = myaudio.dat f = open(name,'rb') f.seek(0) chain = 4s 4s I 4s I 20s I I i 4s I 67s s 4s I s = f.read(4*1+4*1+4*1+4*1+4*1+20*1+4*1+4*1+4*1+4*1+4*1+67*1+1+4*1+4*1) [snip] FYI, the struct module has a function called 'calcsize', so: s = f.read(struct.calcsize(chain)) -- http://mail.python.org/mailman/listinfo/python-list
Re: DBHandler class for logging?
kj schrieb: In 7hsukcf2tqht...@mid.uni-berlin.de Diez B. Roggisch de...@nospam.web.de writes: kj schrieb: I've come across mentions of a mythical class of logging handlers called DBHandler, but I can't find it anywhere. Could someone please point me in the right direction? (FWIW, I'm looking for ways to log messages to PostgreSQL RDBMS.) I'm not aware such a thing is part of the standard logging package. But it's trivial to write one, we did so ourselves. Depending on your version of python, you need to inject the class into the logging.handlers-module to make it loadable by the logfile-format. I'm sorry for my ignorance, but what exactly do you mean by injecting the new class into the logging.handlers-module? And what is the logfile-format? The logfile format as specified in the documentation fo the logging-module. And due to some restrictions in the way how this instantiates declared logging-handlers, you need to set your own class into logging.handlers: import logging.handlers as h class MyHandler(...): ... h.MyHandler = MyHandler # now you can load the config. Diez -- http://mail.python.org/mailman/listinfo/python-list
Re: Not this one the other one, from a dictionary
Thanks for the elaboration;
in retrospect, given the simple requirement, that there are only two
dict keys, one of which is know and the other to be determined, maybe
just the direct dict methods are appropriate, e.g.
d = {'a': 'bob', 'b': 'stu'}
d_copy = dict(d)
d_copy.pop(a)
'bob'
d_copy.popitem()
('b', 'stu')
vbr
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Re: Searching a large dictionary
On Tue, Sep 22, 2009 at 2:50 PM, Support Desk
support.desk@gmail.com wrote:
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
That is not valid syntax. Do you mean you have a dictionary like this?:
{ Key :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key2 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key3 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
}
Cheers,
Chris
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Re: Searching a large dictionary
On Tue, Sep 22, 2009 at 5:50 PM, Support Desk
support.desk@gmail.com wrote:
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
These look like you're indexing objects Key, Key2, Key3 by
dictionaries, or possibly these are the result of printing dict-like
objects with custom __repr__() methods. Could you give more
information about what's actually going on here?
What would be the best way to search for a specific value of item1 and add
all the results to a new dictionary? Thanks
Searching a dict is accomplished by simply asking for the key: d['item1']
I'm going to guess you meant something like this:
list_of_dicts = [Key, Key2, Key3]
new_dict = {}
for i, k in enumerate(list_of_dicts):
value = k['item1']
if value == some_specific_value:
new_dict[i] = value
But it's not really clear from your post exactly what you meant to ask.
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Re: Searching a large dictionary
Chris, Yes that is the correct syntax, thanks
On Tue, Sep 22, 2009 at 5:22 PM, Chris Rebert c...@rebertia.com wrote:
On Tue, Sep 22, 2009 at 2:50 PM, Support Desk
support.desk@gmail.com wrote:
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
That is not valid syntax. Do you mean you have a dictionary like this?:
{ Key :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key2 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key3 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
}
Cheers,
Chris
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Re: Searching a large dictionary
On Tue, Sep 22, 2009 at 6:30 PM, Support Desk
support.desk@gmail.com wrote:
Chris, Yes that is the correct syntax, thanks
Okay, but correct syntax of what? Help us help you.
On Tue, Sep 22, 2009 at 5:22 PM, Chris Rebert c...@rebertia.com wrote:
On Tue, Sep 22, 2009 at 2:50 PM, Support Desk
support.desk@gmail.com wrote:
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
That is not valid syntax. Do you mean you have a dictionary like this?:
{ Key :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key2 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key3 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
}
Cheers,
Chris
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Re: .h files?
What python distributions are you referring to? The ones I know don't make this distinction; there is only a single set of header files that you can choose to install. Ok good to know. -r -- http://mail.python.org/mailman/listinfo/python-list
Re: Searching a large dictionary
On Tue, Sep 22, 2009 at 5:22 PM, Chris Rebert c...@rebertia.com wrote:
On Tue, Sep 22, 2009 at 2:50 PM, Support Desk
support.desk@gmail.com wrote:
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
That is not valid syntax. Do you mean you have a dictionary like this?:
{ Key :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key2 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key3 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
}
On Tue, Sep 22, 2009 at 3:30 PM, Support Desk
support.desk@gmail.com wrote:
Chris, Yes that is the correct syntax, thanks
Ok, so what would the new dictionary you want look like exactly? A
list would seem the natural datatype for the results, but you want a
dict.
Cheers,
Chris
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Re: Searching a large dictionary
-Original Message-
From: Chris Rebert c...@rebertia.com
Sent: Tuesday, September 22, 2009 5:35 PM
To: Support Desk support.desk@gmail.com
Cc: python-list@python.org
Subject: Re: Searching a large dictionary
On Tue, Sep 22, 2009 at 5:22 PM, Chris Rebert c...@rebertia.com wrote:
On Tue, Sep 22, 2009 at 2:50 PM, Support Desk
support.desk@gmail.com wrote:
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
That is not valid syntax. Do you mean you have a dictionary like this?:
{ Key :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key2 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}],
Key3 :
[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
}
On Tue, Sep 22, 2009 at 3:30 PM, Support Desk
support.desk@gmail.com wrote:
Chris, Yes that is the correct syntax, thanks
Ok, so what would the new dictionary you want look like exactly? A
list would seem the natural datatype for the results, but you want a
dict.
On Tue, Sep 22, 2009 at 3:41 PM, Support support.desk@gmail.com wrote:
Chris, a list would work fine, the results are being rendered to a django
template
results = []
for lst in your_dict.values():
d = lst[0]
try:
results.append(d[item1])
except KeyError:
pass
#use results
Cheers,
Chris
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Solved - Python: automate input to MySQL query
Hi Dennis, You're right. Putting allows indentation. Great! About putting the name of the table: x.travelerID, etc.. I think it keep the query more documented, specially when you are dealing with 5 tables in a same query, like this query. Cheers.. Threader. -- Forwarded message -- From: Dennis Lee Bieber wlfr...@ix.netcom.com To: python-list@python.org Date: Tue, 22 Sep 2009 10:43:52 -0700 Subject: Re: Solved - Python: automate input to MySQL query On Tue, 22 Sep 2009 15:58:18 +1000, Threader Slash threadersl...@gmail.com declaimed the following in gmane.comp.python.general: self.db = MySQLdb.connect(hostname,username,passwd,dbname) self.cursor=self.db.cursor(); name=John runQuery=SELECT traveler.travelerFirstName,vaccine.vaccineName from traveler INNER JOIN takenvaccine ON traveler.travelerID = takenvaccine.travelerID INNER JOIN vaccine ON takenvaccine.vaccineID=vaccine.vaccineID INNER JOIN requiredvaccine ON vaccine.vaccineID=requiredvaccine.requiredvaccineID INNER JOIN site ON requiredvaccine.siteID = site.siteID WHERE traveler.travelerFirstName = %s snip Note: you need to declare the whole query in the same line to it take effect in the variable runQuery. No, you don't... IF you wrap it in triple-quotes... runQuery=select t.travelerFirstName, v.vaccineName from traveler as t inner join takenvaccine as tv on t.travelerID = tv.travelerID inner join vaccine as v on tv.vaccineID = v.vaccineID inner join requiredvaccine as rv on v.vaccineID = rv.requiredvaccineID inner join site as s on rv.siteID = s.siteID where t.travelerFirstName = %s Should be perfectly acceptable to Python and the database query processor. I'm not too impressed with the database naming scheme -- if the TABLE is named x, why prefix all the fields in the table with the same x requiredvaccine.requiredvaccineID is rather redundant -- same with all the others. The only place where it might be justified is when it is a foreign key linkage. vaccine.ID ID of the vaccine record requiredvaccine.ID ID of the rv record itself, not of the vaccine requiredvaccine.vaccineID foreign key, ID /in/ vaccine that this record refers to. -- http://mail.python.org/mailman/listinfo/python-list
Re: socket send O(N**2) complexity
On Mon, 21 Sep 2009 16:33:08 -0400, Jack Diederich wrote: AIUI, as a python string is imutable, a slice of a string is a new string which points (C char *) to the start of the slice data and with a length that is the length of the slice, about 8 bytes on 32 bit machine. Not in CPython. While some special strings are re-used (empty string, single letters) if you take a slice of an existing string a new buffer is allocated and the slice memcpy'd into it. Er, why? I can understand doing this for mutable sequences, but it doesn't seem to make much sense for strings. -- http://mail.python.org/mailman/listinfo/python-list
Re: difficulty in understanding rsplit(None,1)[1]
John Machin wrote: On Sep 22, 7:10 pm, hrishy hris...@yahoo.co.uk wrote: Hi Martin Many thanks And by the way great way to explain that thing great way to find out for yourself faster than waiting for a response from the internet ;-) I have been called many things in the past but being labeled 'the internet' is an honour way to big for me ;-) -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
Re: socket send O(N**2) complexity
On Tue, Sep 22, 2009 at 7:25 PM, Nobody nob...@nowhere.com wrote: On Mon, 21 Sep 2009 16:33:08 -0400, Jack Diederich wrote: AIUI, as a python string is imutable, a slice of a string is a new string which points (C char *) to the start of the slice data and with a length that is the length of the slice, about 8 bytes on 32 bit machine. Not in CPython. While some special strings are re-used (empty string, single letters) if you take a slice of an existing string a new buffer is allocated and the slice memcpy'd into it. Er, why? I can understand doing this for mutable sequences, but it doesn't seem to make much sense for strings. Because it adds large amounts of complexity. If you have a string that points to 8 bytes in a 1Gig string and the giant string goes out of scope, what do you do? You can keep it alive, you can copy out 8 bytes; you can do one of those things now or you can wait until later when some kind of garbage collection happens. Once you have that system why not pile ropes on top of it? and once you have ropes why not just make strings mutable ... If you want much longer mailing list threads about the topic search the python-dev archives. -Jack -- http://mail.python.org/mailman/listinfo/python-list
Re: difficulty in understanding rsplit(None,1)[1]
lol -nop nop nop -- http://mail.python.org/mailman/listinfo/python-list
Re: How can I tell if variable is defined
Mel wrote: snip This is an artifact of the interactive interpreter, True. You can avoid the artifact by wrapping the test in a function: Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on linux2 Type help, copyright, credits or license for more information. class A(): ... def __repr__ (self): ... return b ... def is_defined (obj): ... try: ... obj ... except NameError: ... return False ... return True ... a = A() if is_defined (a): ... print `a` is defined ... else: ... print `a` is not defined ... `a` is defined if is_defined (b): ... print `b` is defined ... else: ... print `b` is not defined ... Traceback (most recent call last): File stdin, line 1, in module NameError: name 'b' is not defined At the cost of it not quite working when the function is called with an undefined name. I suppose the print statements could be crafted to make it look better. Mel. No clue what you're trying to accomplish here. The exception inside the function is_defined() will never fire; the method always returns True. You're getting an exception during the attempt to call such a function, and so of course there's no point in putting the if test around that either. This may be the last time I try to read such complexity in an interactive transcript. It took a couple of tries before I got the indentation understood. I thought that is_defined() was intended to be a method inside the class. DaveA -- http://mail.python.org/mailman/listinfo/python-list
Re: Searching a large dictionary
Support Desk wrote:
I need help searching a large python dictionary. The dictionary is setup
like so
Key[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key2[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
Key3[{'item':value,'item2':value,'item3':value,'item4':value,'item5':value','item6':value,'item7':value,'item8':value,'item9':value}]
What would be the best way to search for a specific value of item1 and add
all the results to a new dictionary? Thanks
With all the messages I've seen so far on this thread, all you've
managed to do is confuse it further. I suggest you start over (new
thread) with a legal program defining a single dictionary (with real
values for Key, Key2, and value, and without extra quote marks which
make it fail to compile even if we guess what you're doing with the
three keys). I suggest that at least some relevant parts of the data
should not be all identical, so we can tell what's important.
Use copy paste from working code.
Then given a real dictionary, describe what you really want to search
for, and what acceptable results would be.
And also specify the programming language, version, and OS environment.
Thanks.
DaveA
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Re: set breakpoint in another module/file
I think winpdb ( nothing todo with windows-OS ) can do that and much more. The problem with winpdb (which I played with a long time ago) is that it's much heavier than the built-in pdb--it's a GUI debugger. It requires the beast called wx, which I do not use for web (or GUI) development. I'm don't relish the thought of installing wx just for a debugger. I'm really just looking for a simple function in the pdb module that sets a breakpoint (which can subsequently be removed). Nothing more. ~ Daniel -- http://mail.python.org/mailman/listinfo/python-list
Re: custom data warehouse in python vs. out-of-the-box ETL tool
Thanks for your replies, Sean and Martin. I agree that the ETL tools are complex in themselves, and I may as well spend that learning curve on a lower-level tool-set that has the added value of greater flexibility. Can you suggest a good book or tutorial to help me build a data warehouse in python? Bill Inmon's Building the Data Warehouse is 17 years old, and I've been cautioned against Kimball. Thanks. On Sep 22, 3:40 pm, Martin P. Hellwig martin.hell...@dcuktec.org wrote: snfctech wrote: Does anyone have experience building a data warehouse in python? Any thoughts on custom vs using an out-of-the-box product like Talend or Informatica? I have an integrated system Dashboard project that I was going to build using cross-vendor joins on existing DBs, but I keep hearing that a data warehouse is the way to go. e.g. I want to create orders and order_items with relations to members (MS Access DB), products (flat file) and employees (MySQL). Thanks in advance for any tips. My experience is that if you enjoy hacking around databases and are proficient in Python, than for small scale solutions it is preferable to do it yourself. If you need a large scale solutions with advanced requirements, building it yourself is mostly the only way. I have build a rather complex datawarehouse system in the past (well actually more like a centralised synchronisation hub, having input and reporting databases as satellite clients), shoving data from around 500 databases (typically 5 Gb in size each) spread over the world. The only commercial solutions I reviewed was Business Objects Data Integrator and Oracle Warehouse Builder. These tools where quite flexible and if you already have a license deal which includes these tools I would definitely recommend to have more than just a look at it. If not and you are comfortably with using python to shovel data from A to B and transform it at the same time (moving relational data automatically into a EAV model and back again, for example) than building your own solution will probably save you money and time (as opposed to learn how to use that ETL tool). This will require you to have at least interest in the following subjects: - Authorization, may everybody use all data or should it be limited to a subset on the data depending on the data? (My solution was one centralised hub which contains all data but is only accessible to special 'client' servers strictly maintained by me which only sync the data relevant to them). - Authenticity, if you have different values for the same thing, which one should be considered authoritative and if yes may it be pushed back to the un-authoritative? -Synchronisation, you really don't want to push/pull all of the database content over every x times, so how can you delta it and is there a way to do this only when the data changes (push vs pull)? -ATOMIC, how long may the data be out of date and is it allowed to partially update -Using and maintaining multiple databases, hopefully spread over multiple systems. I had a server for each production DB, a server that mirrored that production DB with some added columns per table for external synchronization purposes and a master synchronisation server (so in essence all data was copied three times, not very efficient but good if you like to play it on the safe side). -- MPHhttp://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
pygui - showing an image
hello, i wonder what the chances are that anyone here uses pygui?
it looks pretty good, but i just started using it (version 2.05) and
can't figure out how to just display a window with an image in it. i
tried:
image = Image('foo.png')
window.place(image) -- error message
window.add(image) -- nothing shows
then i tried getting a canvas involved but that seemed to make things worse.
any hints are appreciated. thanks,
-kyle
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Re: pygui - showing an image
On Tue, Sep 22, 2009 at 9:26 PM, kyle schalm kyle.sch...@gmail.com wrote:
hello, i wonder what the chances are that anyone here uses pygui?
it looks pretty good, but i just started using it (version 2.05) and
can't figure out how to just display a window with an image in it. i
tried:
image = Image('foo.png')
window.place(image) -- error message
window.add(image) -- nothing shows
then i tried getting a canvas involved but that seemed to make things worse.
any hints are appreciated. thanks,
-kyle
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There's an example in Tests/21-image.py
See if that helps.
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Re: Combining sets/dictionaries
Alfons Nonell-Canals alfons.non...@upf.edu wrote: finally I've solved it using a combinatorics library which allows to do this kind of things. If you're using a version of Python 2.6 you might find that itertools.combinations does what you want without requiring the additional code. -- http://mail.python.org/mailman/listinfo/python-list
Re: Combining sets/dictionaries
On Sep 23, 12:44 pm, alex23 wuwe...@gmail.com wrote:
Alfons Nonell-Canals alfons.non...@upf.edu wrote:
finally I've solved it using a combinatorics library which allows to
do this kind of things.
If you're using a version of Python 2.6 you might find that
itertools.combinations does what you want without requiring the
additional code.
Actually, that's probably _not_ what you want, sorry. I don't like the
recursive solution you've found, though, especially as you can get the
same result with a generator expression:
set1 = set(['smart', 'dumb']) # the example on the site is easier to follow
than your use case, sorry
set2 = set(['hard-working', 'lazy'])
list((a,b) for a in set1 for b in set2)
[('smart', 'lazy'), ('smart', 'hard-working'), ('dumb', 'lazy'),
('dumb', 'hard-working')]
set3 = ['crazy', 'sane', 'boring'] # works with iterators of any size
list((a,b) for a in set1 for b in set3)
[('smart', 'crazy'), ('smart', 'sane'), ('smart', 'boring'), ('dumb',
'crazy'), ('dumb', 'sane'), ('dumb', 'boring')]
Hope this helps.
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Re: socket send O(N**2) complexity
On Wed, 23 Sep 2009 00:25:52 +0100, Nobody wrote: On Mon, 21 Sep 2009 16:33:08 -0400, Jack Diederich wrote: AIUI, as a python string is imutable, a slice of a string is a new string which points (C char *) to the start of the slice data and with a length that is the length of the slice, about 8 bytes on 32 bit machine. Not in CPython. While some special strings are re-used (empty string, single letters) if you take a slice of an existing string a new buffer is allocated and the slice memcpy'd into it. Er, why? I can understand doing this for mutable sequences, but it doesn't seem to make much sense for strings. Consider: huge_string = abcdef*1000*1000*1000 tiny_string = huge_string[42:45] del huge_string Under the current behaviour, huge_string will be garbage collected. With the proposed string-view, it won't be. It would be surprising and disturbing if taking a tiny slice of a huge string prohibited the huge string from being garbage collected. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
