Re: why does list's .remove() does not return an object?
On 17-May-2018 12:37, Ned Batchelder wrote: > On 5/17/18 12:28 PM, Dan Strohl via Python-list wrote: > > On 2018-05-17 11:26 AM, Abdur-Rahmaan Janhangeer wrote: > > > I don't understand what this would return? x? You already have x. Is > > > it meant to make a copy? x has been mutated, so I don't understand the > > > benefit of making a copy of the 1-less x. Can you elaborate on the > > > problem you are trying to solve? > > > > > > --Ned. > > > > > > > > > assignment to another var > > > > > Though I don’t know what the OP was specifically looking for I could see a > > benefit to returning the item deleted. > > Notice that this is not the thing the OP wanted returned. I believe they > are looking to return the list, not the item. > I'm guessing that they want to be able to do some sort of method chaining like: the_list.remove(x).remove(y) Although the clarifying example was contrived and confusing. A more concrete example would be greatly appreciated. -- david stanek web: https://dstanek.com twitter: https://twitter.com/dstanek -- https://mail.python.org/mailman/listinfo/python-list
Re: Tips or strategies to understanding how CPython works under the hood
On 09-Jan 15:21, Robert O'Shea wrote: > > Been subscribed to this thread for a while but haven't contributed much. +1. I'm a lurker too. > So besides just grabbing a chunk of CPython source code and digesting it, I > was wondering if those of you have read and understood the source code, do > you have any tips or good starting points? > There are a ton of videos on Youtube that talk about Python internals. I liked https://www.youtube.com/playlist?list=PLzV58Zm8FuBL6OAv1Yu6AwXZrnsFbbR0S quite a bit. Even though I knew a good portion of the material, there was still a lot of new stuff. -- david stanek web: https://dstanek.com twitter: https://twitter.com/dstanek -- https://mail.python.org/mailman/listinfo/python-list
Re: Application and package of the same name
On 19-Oct 19:34, Paul Moore wrote: > On 19 October 2017 at 19:18, Skip Montanaro <skip.montan...@gmail.com> wrote: > > > > This is in Python 2.7, FWIW. What am I missing? > > My immediate reaction is "you shouldn't name your main program and > your package the same". It's not a pattern I've seen commonly used. > This is actually a common pattern I see when teaching the language. For example, when a student wants to test out a package like requests many seem to initially want to create a requests.py module. Then they become very confused when they get an AttributeError on requests.get(). -- david stanek web: https://dstanek.com twitter: https://twitter.com/dstanek -- https://mail.python.org/mailman/listinfo/python-list
[issue2445] Use The CygwinCCompiler Under Cygwin
Changes by David Stanek <dsta...@dstanek.com>: -- nosy: -dstanek ___ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue2445> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue900092] hotshot.stats.load fails with AssertionError
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue900092 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Inconsistent SMTP/Gmail connection drop
On Wed, Aug 3, 2011 at 5:46 PM, Astley Le Jasper astley.lejas...@gmail.comwrote: Any ideas? Is it possible that the first email is sent before the network connection has been properly established? -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek www: http://dstanek.com -- http://mail.python.org/mailman/listinfo/python-list
[issue8036] Interpreter crashes on invalid arg to spawnl on Windows
David Stanek dsta...@dstanek.com added the comment: Should this just be resolved as a won't fix? -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8036 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6584] gzip module has no custom exception
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6584 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8025] TypeError: string argument expected, got 'str'
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8025 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7659] Attribute assignment on object() instances raises wrong exception
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7659 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4492] httplib code thinks it closes connection, but does not
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4492 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2007] cookielib lacks FileCookieJar class for Internet Explorer
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2007 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9233] json.load failure when C optimizations aren't built
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9233 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3849] FUD in documentation for urllib.urlopen()
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3849 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5097] asyncore.dispatcher_with_send undocumented
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5097 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8743] set() operators don't work with collections.Set instances
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8743 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7100] test_xmlrpc: global name 'stop_serving' is not defined
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7100 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10993] HTTPSConnection does not close when call close() method
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10993 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10983] Errors in http.client.HTTPConnection class (python3)
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10983 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5885] uuid.uuid1() is too slow
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5885 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue10911] cgi: add more tests
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue10911 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2193] Cookie Colon Name Bug
David Stanek dsta...@dstanek.com added the comment: My Java may be a bit rusty, but it seems that it would filter out the colon. tspecials contains a colon and thus having a colon in the cookie name would make in invalid. I glanced at the Perl code and couldn't find where it filtered out any characters. Would it be better to file bugs against buggy implementations instead of changing Python's implementation to be more lenient? -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2193 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1210680] Split email headers near a space
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1210680 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7275] CoverageResult fails to merge input file with non-empty callers in trace.py (patch)
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7275 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8722] Documentation for __getattr__
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8722 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5843] Possible normalization error in urlparse.urlunparse
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5843 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7159] Urllib2 authentication memory.
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7159 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9417] Declaring a class creates circular references
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9417 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1573931] WSGI, cgi.FieldStorage incompatibility
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1573931 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5587] vars() no longer has a useful __repr__
David Stanek dsta...@dstanek.com added the comment: A possible fix is to add a __repr__ implementation to proxydict. I've attached a patch and also posted it to: http://codereview.appspot.com/1908043. -- keywords: +patch nosy: +dstanek Added file: http://bugs.python.org/file18376/5587.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5587 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9500] urllib2: Content-Encoding
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9500 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7013] Httplib read routine is not tolerant to not well-formed chunked http responses.
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7013 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5931] Python runtime name hardcoded in wsgiref.simple_server
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5931 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8280] urllib2 passes fragment identifier to server
David Stanek dsta...@dstanek.com added the comment: Added a patch to fix this behavior. -- keywords: +patch nosy: +dstanek Added file: http://bugs.python.org/file18358/fragment.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8280 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8280] urllib2 passes fragment identifier to server
David Stanek dsta...@dstanek.com added the comment: I have also uploaded my patch to http://codereview.appspot.com/1918042 so easier viewing. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8280 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue754016] urlparse goes wrong with IP:port without scheme
David Stanek dsta...@dstanek.com added the comment: I've reworked the patch so that it applied against the py3k branch. It's been attached to this issue and is also available here: http://codereview.appspot.com/1910044. -- nosy: +dstanek Added file: http://bugs.python.org/file18362/754016.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue754016 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6602] BaseHTTPServer log_message should log to sys.stdout
David Stanek dsta...@dstanek.com added the comment: I think this is the right thing to do. To help this along I've included a patch. The codereview is also available: http://codereview.appspot.com/1697062. -- keywords: +patch nosy: +dstanek Added file: http://bugs.python.org/file18365/6602.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6602 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8757] Race condition when checking for set in set
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8757 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7464] circular reference in HTTPResponse by urllib2
David Stanek dsta...@dstanek.com added the comment: Does this issue still exist? I did a little poking around at could not find the quoted code. -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7464 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1673007] urllib2 requests history + HEAD support
David Stanek dsta...@dstanek.com added the comment: I have attached a patch to add support for HEAD, PUT and DELETE methods. The code review is available here: http://codereview.appspot.com/1696061. I have started working on another patch that validates that the method is properly set. For instance, it doesn't make sense to have a HEAD or DELETE with post data. The problem is that the interface is so wide open that it is hard to catch all possible user errors. A user could call Request.__init__ correctly, but then set req.method to an invalid method. If there is some interest I'll finish up the patch. -- nosy: +dstanek Added file: http://bugs.python.org/file18369/1673007_methods.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1673007 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8150] urllib needs ability to set METHOD for HTTP requests
David Stanek dsta...@dstanek.com added the comment: In issue #1673007 I submitted a patch that enables the programmer to create a Request instance and specify the method to use. -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8150 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4493] urllib2 doesn't always supply / where URI path component is empty
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4493 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9141] Allow objects to decide if they can be collected by GC
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9141 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2244] urllib and urllib2 decode userinfo multiple times
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2244 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue2304] subprocess under windows fails to quote properly when shell=True
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2304 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7839] Popen should raise ValueError if pass a string when shell=False or a list when shell=True
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7839 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue9370] Add reader redirect from test package docs to unittest module
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue9370 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6293] Have regrtest.py echo back sys.flags
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6293 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8910] Write a text file explaining why Lib/test/data exists
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8910 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7331] Command line testing consistency between 2.x and 3.x
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7331 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7325] tempfile.mkdtemp() does not return absolute pathname when dir is specified
Changes by David Stanek dsta...@dstanek.com: -- nosy: +dstanek ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7325 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8572] httplib getheader() throws error instead of default
David Stanek dsta...@dstanek.com added the comment: I created some tests for the existing behavior and the expected behavior. One of my apps was passing in a tuple and the default. Since this already worked and there are probably others besides me expecting this behavior I changed the patch to handle this. The new patch treats any non-string value as an iterable and performs a ', '.join() on it. This is basically the old behavior. This patch is against the py3k branch. -- nosy: +dstanek Added file: http://bugs.python.org/file18299/8572.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8572 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8572] httplib getheader() throws error instead of default
David Stanek dsta...@dstanek.com added the comment: Adding a patch that includes a documentation change. -- Added file: http://bugs.python.org/file18302/8572-with-docs.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8572 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Function to apply superset of arguments to a function
On Wed, Sep 9, 2009 at 12:45 PM, Andrey Fedorovanfedo...@gmail.com wrote: Hi all, I've written a function [1] called apply_some which takes a set of keywords arguments, filters only those a function is expecting, and calls the function with only those arguments. This is meant to suppress TypeErrors - a way to abstract the logic which checks what arguments a passed-in function accepts. For example: def foo(x=1, y=2): return (x,y) apply_some(foo, y=0, z=hi) // calls foo(y=0) - (1,0) I'd like to expand this to fill undefined arguments with None, but before I do, does anyone know of any packages/libraries which either do something similar or would make this code cleaner? Cheers, Andrey 1. http://gist.github.com/183375 -- http://mail.python.org/mailman/listinfo/python-list What is your use-case for using this? It seems really odd to me. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: HTTP POST File without cURL
On Wed, Sep 9, 2009 at 1:57 PM, John D Giottajdgio...@gmail.com wrote: I'm working with an API that allows me to POST a zip file via HTTP and the documentation uses a cURL example. cURL works, but when I try to POST the file via python it fails. I don't want to use cURL (since I'm trying to be transparent and dependency-less), but I can't find anything online that works. When I use multipart/form-data methods (found here http://code.activestate.com/recipes/146306/), the recipient cannot decipher the attached file. This is about the most difficult thing I've had to do with python and yet it is supposed to be the very basics of HTTP. Example cURL command: curl -v -u username:passwd --data-binary @/home/jdgiotta/test.zip -H Content-Type: application/zip https://host/selector Is there a valid way to do this? Without seeing code it is hard to tell what is happening. What I would do is capture the HTTP traffic and compare Python to cURL. Then you'll know how to change you script. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Function to apply superset of arguments to a function
On Wed, Sep 9, 2009 at 5:03 PM, Melmwil...@the-wire.com wrote: David Stanek wrote: On Wed, Sep 9, 2009 at 12:45 PM, Andrey Fedorovanfedo...@gmail.com wrote: I've written a function [1] called apply_some which takes a set of keywords arguments, filters only those a function is expecting, and calls the function with only those arguments. This is meant to suppress TypeErrors - [ ... ] What is your use-case for using this? It seems really odd to me. I may have run into one possible use. I have a program that uses DB-API 2.0 to work with a database, sometimes SQLite3, sometimes PostgreSQL. Connect parameters are built up in a dict from a combination of defaults, environment values, and command-line arguments. This dictionary has to be pruned down before calling connect, because sqlite3.connect doesn't take the wide assortment of arguments that are needed for PostgreSQL. The existing program does this by hand, being programmed in advance to know which parameters are acceptable to which database module. The way I would normally do it is to use the URI format and based on the scheme choose a handler. For example: mysql://u...@host:server/db, would translate to a mysql specific function that knows what to do. Adding support for new schemes does mean an additional function, but I like the control. And it's explicit. I worry about the magic of the OP's approach. In your example generate a dictionary in a generic way and apply it to a set of functions. What happens if in the future if connect_mysql adds adds a parameter with the same name as one in connect_postgres, but different semantics. Now the magic is broken and you have an ugly special case. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Python server locks up
On Wed, Sep 9, 2009 at 4:28 PM, Zac Burnszac...@gmail.com wrote: How would you suggest to figure out what is the problem? I don't think you said your OS so I'll assume Linux. Sometimes it is more noise than value, but stracing the process may shed light on what system calls are being made. This in turn may help you narrow your focus. I find strace helps me a ton in some really tough problems. Are you watching for swapping, CPU usage, etc.? -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: hashability
On Wed, Aug 12, 2009 at 2:18 AM, Asun Friereafri...@yahoo.co.uk wrote: On Aug 12, 3:32 pm, James Stroud nospamjstroudmap...@mbi.ucla.edu wrote: You should be more imaginative. I'm by no means discounting that there might be some actual problem you're trying to solve here, but I honestly can't see it. How about a cache? Hashing by id means nothing across machines or even process runs on the same machine. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: httplib incredibly slow :-(
On Tue, Aug 11, 2009 at 4:25 PM, Chris Withersch...@simplistix.co.uk wrote:
Hi All,
I'm using the following script to download a 150Mb file:
from base64 import encodestring
from httplib import HTTPConnection
from datetime import datetime
conn = HTTPSConnection('localhost')
headers = {}
auth = 'Basic '+encodestring('username:password').strip()
headers['Authorization']=auth
t = datetime.now()
print t
conn.request('GET','/somefile.zip',None,headers)
print 'request:',datetime.now()-t
response = conn.getresponse()
print 'response:',datetime.now()-t
data = response.read()
print 'read:',datetime.now()-t
The output shows it takes over 20 minutes to do this.
However, this is on a local network, and downloading the same file in IE
takes under 3 seconds!
I saw this issue:
http://bugs.python.org/issue2576
I tried changing the buffer size to 4096 in a subclass as the issue
suggested, but I didn't see the reported speed improvement.
I'm using Python 2.6.2.
Does anyone know of an alternative library for creating http requests and
getting their responses that's faster but hopefully has a similar interface?
I tried to reproduce this, but I could not. Could you paste in the
output of your script? Also on the same box where you run this script
can you test with curl or wget?
--
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek
--
http://mail.python.org/mailman/listinfo/python-list
Re: Is feedparser deprecated?
On Fri, Aug 7, 2009 at 3:07 PM, John Naglena...@animats.com wrote: Feedparser requires SGMLlib, which has been removed from Python 3.0. Feedparser hasn't been updated since 2007. Does this mean Feedparser is dead? The release is from 2007, but there are several recent commits. http://code.google.com/p/feedparser/source/list -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: sqlite3 performance problems only in python
On Thu, Jul 23, 2009 at 9:02 AM, Stef Mientkistef.mien...@gmail.com wrote: btw, I don't know if it's of any importance, the SQL-statement I perform is select OPNAMEN.*, NAME, NAME_, SCORES.SCORE, PATIENT.* from OPNAMEN inner join POID_VLID on OPNAMEN.POID = POID_VLID.POID inner join VRAAGLST on VRAAGLST.VLID = POID_VLID.VLID inner join VLID_SSID on VRAAGLST.VLID = VLID_SSID.VLID inner join SUBSCHAAL_GEGEVENS on SUBSCHAAL_GEGEVENS.SSID = VLID_SSID.SSID inner join POID_SSID_SCID on ( OPNAMEN.POID = POID_SSID_SCID.POID ) and ( SUBSCHAAL_GEGEVENS.SSID = POID_SSID_SCID.SSID ) inner join SCORES on SCORES.SCID = POID_SSID_SCID.SCID inner join PID_POID on OPNAMEN.POID = PID_POID.POID inner join PATIENT on PATIENT.PID = PID_POID.PID where substr ( lower( NAME) , 1, 6) = 'cis20r' and lower ( NAME_ ) = 'fatigue' and TEST_COUNT in (3,4) and DATETIME 39814.0 and SCORE 30 Warning: I suck at SQL and hate it with a passion... By using lower() on the left side of the where expressions I believe that you are table scanning. So it is not the size of the data returned, but the size of the data that needs to be scanned. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: sqlite3 performance problems only in python
On Thu, Jul 23, 2009 at 6:29 PM, Stef Mientkistef.mien...@gmail.com wrote: but because the same SQL-statement in Delphi performed well, I thought it was a problem with the Python implementation. Same SQL, but were you also using Sqlite in Delphi? -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Changing the private variables content
On Tue, Jul 21, 2009 at 6:00 PM, Rhodri Jamesrho...@wildebst.demon.co.uk wrote: On Tue, 21 Jul 2009 21:55:18 +0100, Ryniek90 rynie...@gmail.com wrote: Hi. I'm writing some class, and decided to use inside private method and some private variables. While with method i haven't got any problem's with variables i have. There is no mechanism in Python that makes attributes truly private. self._number is an attribute just like any other, the whole business with _leading_underscores is purely a matter of convention. If you have an instance attribute or method with a leading underscore, you know that using it or calling it isn't something you're supposed to do outside its class, but nothing will stop you doing exactly that if you're rude enough to try. Doubling the _ will give you a little more privacy. It really just mangles the attribute name, but it close to what you want. I just use a _single_under to tell other programmers that they shouldn't be accessing that attribute directly. To my knowledge nothing bad has happened because things are public and using the __double_under makes testing a little harder. class C(object): ... def __init__(self): ... self.__x = 0 ... c = C() c.__x Traceback (most recent call last): File stdin, line 1, in module AttributeError: 'C' object has no attribute '__x' c._C__x 0 -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Python import Error
On Sat, Jul 18, 2009 at 3:14 AM, Kalyan Chakravarthykalyanchakravar...@hyit.com wrote: Hi All, I am using Python 2.6, MySQL 4.0 , I have successfully Instaled MySQLdb (MySQL-python-1.2.3c1.win32-py2.6) in my system. I tested through command prompt with import MySQLdb , its not shwing any errors (means its instaled successfully), I set Eneceranment variable for Python I am running simple application with import MySQLdb to get the connection to MySQL, But its throwing No module named MySQLdb, Please any one tell me what couled be the reasion is there any version miss match with python and MySQL ? Since last 3days I am strugling on this Off the top of my head I would say that maybe you are using one python binary from the command-line and another in your script or possibly your python path is foobar. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Override a method but inherit the docstring
On Fri, Jul 17, 2009 at 2:58 AM, Peter Otten__pete...@web.de wrote: Ben Finney wrote: Howdy all, The following is a common idiom:: class FooGonk(object): def frobnicate(self): Frobnicate this gonk. basic_implementation(self.wobble) class BarGonk(FooGonk): def frobnicate(self): special_implementation(self.warble) The docstring for ‘FooGonk.frobnicate’ is, intentionally, perfectly applicable to the ‘BarGonk.frobnicate’ method also. Yet in overriding the method, the original docstring is not associated with it. Ideally there would be a way to specify that the docstring should be inherited. The best I can come up with is:: class BarGonk(FooGonk): def frobnicate(self): special_implementation(self.warble) frobnicate.__doc__ = FooGonk.frobnicate.__doc__ but that violates DRY (the association between BarGonk and FooGonk is being repeated), puts the docstring assignment awkwardly after the end of the method instead of at the beginning where docstrings normally go, and reads poorly besides. What is the most Pythonic, DRY-adherent, and preferably least-ugly approach to override a method, but have the same docstring on both methods? Just thinking aloud: Write a patch for pydoc that looks up the base-class documentation. B.f.__doc__ will continue to return None, but help(B.f) will show something like No documentation available for B.f. Help for A.f: yadda yadda Of course that might be misleading when A.f and B.f are up to something completely different... This should never be the case. It violates LSP and would be very confusing to readers of the code. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Override a method but inherit the docstring
On Fri, Jul 17, 2009 at 3:52 AM, Steven D'Apranost...@remove-this-cybersource.com.au wrote: On Fri, 17 Jul 2009 12:58:48 +1000, Ben Finney wrote: Using a decorator in this manner requires repeating the super class name. Perhaps there is a way to get the bases of BarGonk, but I don't think so, because at the time that the decorator is called, BarGonk is not yet fully defined. Yes, I tried a few different ways, but within the decorator it seems the function object is quite unaware of what class it is destined for. When the decorator is called, the function object is just a function object, not a method, so there is no concept of what class it is destined for. def dec(func): ... print type(func) ... try: ... print func.im_class ... except: ... print no im_class ... return func ... class Test(object): ... @dec ... def spam(self): ... pass ... type 'function' no im_class type(Test.spam) type 'instancemethod' Test.spam.im_class class '__main__.Test' I suppose you could try to determine what namespace you're currently when the class is created, but that's surely going to be fragile and messy. It isn't too bad. I got the idea to use the method's enclosing scope[1] in my decorator[2] from DecoratorTools. I am working to remove it because it make me sad, but it does work. [1] http://code.google.com/p/snake-guice/source/browse/snakeguice/decorators.py#51 [2] http://code.google.com/p/snake-guice/source/browse/snakeguice/decorators.py#58 -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: How to unbuffer Python's output
2009/7/14 Lily Gao lily@autodesk.com: Hi, All I am calling a python program in perl and use redirection, Like : `python x.py 1.log 21` Try tihs instead: python x.py 21 1.log -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for the right library for a simple HTTP client
On Fri, Jul 10, 2009 at 1:29 AM, scriptlear...@gmail.comscriptlear...@gmail.com wrote: I am trying to implement a simple client that can do the following: 1)to send the following kinds of HTTP requests and validate responses 1.1 GET 1.2 POST with application/x-www-form-urlencoded encoding 1.3 POST with multipart/form-data encoding 2)to set any number of (even duplicate) headers. For example, I may intentionally add the following Cookie: headers to a request: Cookie: id_1=v1;Domain=sample.com;Path=/ Cookie: id_1=v1;Domain=sample.com;Path=/ --same as the one above Cookie: id_2=v1;Domain=sample.com;Path=/ 3)to set proxy cfg so requests can go through a proxy server to reach the target server. 4)to send multiple requests simultaneously. I have Python 2.4.1 on Solaris 9 and 10, and I don't have any plan to upgrade to latest version of Python. I looked around and I found httplib and urllib. Are they sufficient for my tasks 1 to 3 above? Any good sample codes will be great. Thanks. -- http://mail.python.org/mailman/listinfo/python-list I like urllib2. The examples[1] are pretty good. [1] http://www.python.org/doc/2.4.1/lib/urllib2-examples.html -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Unexpected behaviour of inner functions/ decorators
On Tue, Jun 30, 2009 at 1:44 PM, Francesco Bochicchiobieff...@gmail.com wrote: [snip] It looks like the decorator uses an older instance of 'funct', which does not yet have the attribute dinamically attached to it. This seem to be confirmed by the fact that adding the attribute before rebinding the function name, the problem disappear: The decorator is using the original function that you defined. By decorating 'funct' you are actually rebinding that name to the 'inner_f' function. So the statement 'funct.enabled = True' is actually creating an enabled property on the 'inner_f' function. Take a look at this code: def def_f(f): ... def inner_f(): ... if iam.enabled: ... f() ... iam = inner_f ... return inner_f ... @def_f ... def funct(): ... print 'Ciao' ... funct.enabled = True funct() Ciao -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Get name of class without instance
Try Foo.__name__ if Foo is a class object. On 6/24/09, Bryan bryanv...@gmail.com wrote: Given a class: class Foo(object): pass How can I get the name Foo without having an instance of the class? str(Foo) gives me more than just the name Foo. __main__.Account Foo.__class__.__name__ gives me type I don't want to do: Foo().__class__.__name__ if possible. I would rather avoid the constructor. I just want to get a string Foo -- http://mail.python.org/mailman/listinfo/python-list -- Sent from my mobile device David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Guidance on initialization code in a module
On Tue, Jun 16, 2009 at 4:54 PM, mrstevegrossmrstevegr...@gmail.com wrote: Is there a common way to initialize various stuff in a module? That is, I have some code in my module that I want to run whenever the module is imported. Currently, my module looks like this: === foo.py === def something(): ... def somethingelse(): ... something() === EOF === Is the 'something()' line at the end in an ok location? I just put it at the end. Maybe there's some special __init__() mechanism for modules? Or should I use the 'if __name__ != '__main__'' trick? I think what you are doing is fine. The only thing that I would do differently is rename 'something' to 'initialize'. That way your intent is really obvious. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Odd closure issue for generators
On Thu, Jun 4, 2009 at 7:42 PM, Scott David Danielsscott.dani...@acm.org wrote: Brian Quinlan wrote: This is from Python built from the py3k branch: c = (lambda : i for i in range(11, 16)) for q in c: ... print(q()) ... 11 12 13 14 15 # This is expected c = (lambda : i for i in range(11, 16)) d = list(c) for q in d: ... print(q()) ... 15 15 15 15 15 # I was very surprised You are entitled to be surprised. Then figure out what is going on. Hint: it is the moral equivalent of what is happening here: c = [] for i in range(11, 16): c.append(lambda: i) i = 'Surprise!' print([f() for f in c]) ['Surprise!', 'Surprise!', 'Surprise!', 'Surprise!', 'Surprise!'] i = 0 print([f() for f in c]) [0, 0, 0, 0, 0] The body of your lambda is an un-evaluated expression with a reference, not an expression evaluated at the time of loading c. TO get what you expected, try this: c = [] for i in range(11, 16): c.append(lambda i=i: i) i = 'Surprise!' print([f() for f in c]) [11, 12, 13, 14, 15] When you evaluate a lambda expression, the default args are evaluated, but the expression inside the lambda body is not. When you apply that evaluated lambda expression, the expression inside the lambda body is is evaluated and returned. Getting around this can be pretty easy: c = (lambda i=i: i for i in range(11, 16)) for q in (list(c)): print(q()) -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: pylint naming conventions?
On Sun, Jun 7, 2009 at 9:23 AM, Esmailebo...@hotmail.com wrote: Ben Finney wrote: Esmail ebo...@hotmail.com writes: I am confused by pylint's naming conventions, I don't think the are in tune with Python's style recommendations (PEP 8?) Anyone else think this? It's hard to know, without examples. Can you give some output of pylint that you think doesn't agree with PEP 8? Sure, I will next time I have a nice self-contained example. Perhaps not that many people are using pylint? I was expecting a bunch of messages either contradicting my observation or agreeing with it :-) .. but perhaps this indicates that there's no issue. It is my understanding that it does check for PEP8 names. Even if it doesn't it is really easy to change. If you run 'pylint --generate-rcfile' (i think) it will output the configuration that it is using. You can then save this off and customize it. I'll try to come up with a nice short code example in the next few days to demonstrate what I think the problem is and post it, thanks for the suggestion. If you didn't have an example handy what prompted you to start this thread? -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: try except inside exec
On Fri, May 29, 2009 at 11:55 AM, Michele Petrazzo michele.petra...@remove_me_unipex.it wrote: My goal is to execute a function received from a third-part, so I cannot modify as you made in your first piece of code. I want a clean exception with the real line code/tb so I can show a real error message. This means that the try/execpt has to include the passed function and catch every possible exception. Do you have any ideas on how can I figure this out? Is the thirdparty function the entire STR or just the a_funct part? -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: strip char from list of strings
On Mon, May 18, 2009 at 3:30 PM, Laurent Luce laurentluc...@yahoo.com wrote: I have the following list: [ 'test\n', test2\n', 'test3\n' ] I want to remove the '\n' from each string in place, what is the most efficient way to do that ? What have you tried so far? -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Performance java vs. python
On Tue, May 19, 2009 at 5:43 PM, namekuseijin namekusei...@gmail.com wrote: someone said: If you took a look at Java, you would notice that the core language syntax is much simpler than Python's. thanks for the laughs whoever you are! I'm no Java fan, but I do agree that the core language is a bit easier for people to grasp. I have also heard that from other developers as well. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Python code-bloat tool-- warning n00b stuff...
On Mon, May 18, 2009 at 12:45 PM, david wright I would suggest looking into TDD (test driven development). This technique would be a good fit to eliminate you feeling of code bloat, in TDD you only write the necessary amount of code to make your test pass, hence you never write code that is not going to be utilized. It takes a little while to get used to this technique ( also, it can be much more difficult to apply in some situations) but it's well worth the effort. :). You'll have no trouble finding tons of resources for this topic. TDD does help cut down on code bloat, but not because you are only coding what will actually be used. Rather because of rule #3: 1. Red - write just enough test code to make a test fail 2. Green - write just enough production code to make the test pass 3. Refactor - mercilessly reduce duplication 4. Repeat -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: object query assigned variable name?
On Fri, May 1, 2009 at 12:48 PM, Steven D'Aprano st...@remove-this-cybersource.com.au wrote: On Fri, 01 May 2009 09:24:10 -0700, warpcat wrote: I'd like it to print, when instanced, something like this: s = Spam() I’m assigned to s! But it seems prohibitively hard (based on my web and forum searches) for an object to know what variable name is has been assigned to when created. Can't be done. Objects don't know what names they are bound to. While objects don't know what they are assigned to, they can be made to find out. Unless you have a good use case I don't think that you really want to be doing it. DecoratorTools allows you to do this. I have code that allows you to use a a function like: class C: attr = inject(Customer) The inject function does know that it is being assigned to attr. There is tracing/frame introspection black magic involved. So much so that I have been debating removing that feature. The code is on Bitbucket[1]. It has a little extra complication because inject can also be used as a decorator. The key is the decorate_assignment call in the inject function. Again I don't think you really want to do this. [1] http://bitbucket.org/dstanek/snake-guice/src/tip/snakeguice/decorators.py -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Packages : A looming problem? packages might no longer work? (well not on your platform or python version anyway)
On Thu, Apr 23, 2009 at 2:47 AM, Daniel Fetchinson fetchin...@googlemail.com wrote: The OP is just thinking out loud that it would be great if developers could count on some help for testing various platforms and versions. And I agree, it would indeed be great. I think you interpreted the OP differently. As I said before the idea is not a bad one, but as a package developer I get to decide which platforms and versions my code supports. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Packages : A looming problem? packages might no longer work? (well not on your platform or python version anyway)
On Thu, Apr 23, 2009 at 12:33 AM, David Lyon david.l...@preisshare.net wrote: Hi Steve, Why should the package developer dictacte which python version the package will run on ? Because they're the developer. Who else should decide what Python versions to support? The developer shouldn't be making such decisions at all What hardware or operating systems we run his/her programs on is up to the real world to decide. If you think about it logically... why are we even asking our developers to even build their packages for specific python versions in the first place? They should just: You should abandon this argument. Your original idea of a huge build infrastructure had some merit. This is just off the wall. If I use win32com how do you expect me to support Linux? What about the many packages on PYPI containing C? What if I decide to write only to Python 3? Who will support the other platforms if not the developer? -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Packages : A looming problem? packages might no longer work? (well not on your platform or python version anyway)
On Thu, Apr 23, 2009 at 1:12 PM, norseman norse...@hughes.net wrote: BB's, User Lists, all repositories can make these required before acceptance. This is open source. I volunteer my time on the projects that I maintain. If you don't like the quality or lack of documentations, tests, etc. Contribute. Or just don't use the software. What maybe another option is to have a karma rating on PYPI. Maybe based off of home much you are included in other packages or some other factors. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Configuring pylint for local conventions (was: pyflakes, pylint, pychecker - and other tools)
On Thu, Apr 23, 2009 at 12:00 PM, Aahz a...@pythoncraft.com wrote: In article 874owf4gky.fsf...@benfinney.id.au, Ben Finney ben+pyt...@benfinney.id.au wrote: a...@pythoncraft.com (Aahz) writes: Second, you can configure pylint to respect your personal style How? I haven't seen any decent documentation on doing so. Actually, I don't know how, I'm just repeating what was claimed at a presentation on pylint. ;-) I've traditionally used pychecker myself and haven't seen any reason to switch. I believe you just: pylint --generate-rcfile ~/.pylintrc and then customize that file. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Configuring pylint for local conventions
On Thu, Apr 23, 2009 at 10:21 PM, Ben Finney ben+pyt...@benfinney.id.au wrote: Ben Finney ben+pyt...@benfinney.id.au writes: David Stanek dsta...@dstanek.com writes: I believe you just: pylint --generate-rcfile ~/.pylintrc and then customize that file. This is the part that I'm asking how to do. What documentation is there on this configuration file and recommendations on how to modify it? For bonus points, I'm actually wanting to know how to configure it per *project*, and applying that configuration for all programmers of that project. Having one set of coding conventions per *user* seem like a recipe for frustration. I find that the comments in the file it generates are enough. I haven't needed any more documentation than that. For project specific configuration I just keep a config file[1] in the project's source repository. Then make my build script[2] specify that file when I run 'paver lint'. [1] http://bitbucket.org/dstanek/snake-guice/src/tip/pylint.cfg [2] http://bitbucket.org/dstanek/snake-guice/src/tip/pavement.py -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: execfile (exec?) create non consistent locals() state
I expected exec to work the same, but apparently I was wrong. Is there is a
way to exec a file more correctly? thus avoid the need to resort to
awkward solutions such as using the locals() dictionary?
I don't know personally. Perhaps a kind soul will chime in.
Why not just exec into a dictionary like this:
{{{
eee0:~% cat execme.py
a = 0
def func():
print a
eee0:~% python
Python 2.5.2 (r252:60911, Oct 5 2008, 19:24:49)
[GCC 4.3.2] on linux2
Type help, copyright, credits or license for more information.
d = {}
execfile('execme.py', d, d)
d['a']
0
d['func']()
0
}}}
--
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python Packages : A looming problem? packages might no longer work? (well not on your platform or python version anyway)
On Wed, Apr 22, 2009 at 7:06 PM, David Lyon david.l...@preisshare.net wrote: One of the big challenges for Python going forward is providing a testing infrastructure for Python Packages. There are now over 6,000 packages listed on PyPi - and this number can only get bigger. Interesting ideas, but I'm not sure I see the value. As a package developer I publish eggs for various Python versions and a source package. In some of my newer stuff I have been thinking of using 2.6+ features, which means I don't care if it runs on any other version. I've been fine so far in relying on my code running the same on all platforms. I don't use any of the platform specific modules, but if I did as a package developer I can just say too bad -you need Linux. I have been bitten a few times by hardcoding '/' instead of os.path.sep, but I get a bug report and make a fix. So far no big deal. I think that if you do this or snakebite gets up and running then projects should opt in to platform/Python versions. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Python Packages : A looming problem? packages might no longer work? (well not on your platform or python version anyway)
On Wed, Apr 22, 2009 at 10:39 PM, David Lyon david.l...@preisshare.net wrote: Hi David, Yes, I agree... But as an end-application-developer, I would put it to you that it is a lot of effort for developers to humanly contact the package developers every time we end-developers find a bug. The task (for us developers) involves: finding the project page for the project... finding their tracking system.. sometimes finding the project is abandoned entering the bug waiting a few days If they took the time to find the package, install the package and learn to use it then they can file a bug report. And if it is on a platform that I don't have access to who will submit the patch? Given that Python 3 is now on its way It strikes me that are a lot of packages that are about to break. I think it is safe to assume that if the package maintainer didn't port to Python 3 that it won't work. What I am talking about (regression testing) already exists in the Perl world.. So I am hoping to have at least the same in the Python Universe It seems to me that from your perspective there would be no change? just bug reports coming sooner, rather than later. Not really. If you are running my unit tests then you have a 50/50 chance of finding a bug. The path bug I mentioned earlier would not have been found on Windows by running my tests. It would, however, been caught by real usage. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Passing all extra commandline arguments to python program, Optparse raises exception
On Thu, Apr 16, 2009 at 10:05 AM, sapsi saptarshi.g...@gmail.com wrote:
Hello,
Im using optparse and python 2.6 to parse some options, my commandline
looks like
prog [options] start|stop extra-args-i-will-pas-on
The options are --b --c --d
The extra options are varied are are passed onto another program e.g --
quiet --no-command , my program doesnt care what these are but instead
passes them onto another program.
I know these will always follow start|stop.
However optparse tries to process them and throws an exception - how
can i prevent this without placing all the extra-args in quotes.
In Linux (maybe in Windows) you can tell an application to stop
processing args by using '--'. Given this code:
import sys
from optparse import OptionParser
op = OptionParser()
op.add_option('--a', dest='a', action='store_true', default=False)
op.add_option('--b', dest='b', action='store_true', default=False)
opts, args = op.parse_args(sys.argv)
print 'opts:', opts
print 'args:', args
Here is an example use:
eee0:~% python junk.py --a -- --c
{'a': True, 'b': False}
['junk.py', '--c']
--
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek
--
http://mail.python.org/mailman/listinfo/python-list
Re: Imports in python are static, any solution?
On Mon, Apr 13, 2009 at 11:59 AM, Ravi ra.ravi@gmail.com wrote: foo.py : i = 10 def fi(): global i i = 99 bar.py : import foo from foo import i print i, foo.i foo.fi() print i, foo.i This is problematic. Well I want i to change with foo.fi() . Why not only import foo and using foo.i? In fi() when you set i = 99 you are creating a new object called i in foo's namespace. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Spring-like IoC in python?
On Sun, Apr 5, 2009 at 5:51 AM, Giovanni Giorgi j...@objectsroot.com wrote: Hi all, I have just read the Thread Thoughts on language-level configuration support? started by jfager. I have worked in the past days with Java Spring. I found very valuable the ideas behind Inversion of Control (IoC). I think it should be a very nice feature to get into python too. In detail, I think the most important concept is the ability to auto-wire dependencies declared in the configuration file. It is the added value of such idea in my own opinion. Spring is heavily based on type declaration (in form of concrete class of interfaces) so this approach is not the preferred path in a dynamically language like Python. Do someone have tried or seen something like IoC container based on Python? There are several projects implementing IoC in Python. The three I am most familiar with are snake-guice[0], pinsor[1] and SpringPython[2]. I think they are all worth investigating. I started snake-guice as a clone of the google-guice project (a Java IoC framework.) I liked several things that I just didn't see anywhere else: 1. Language based configuration because XML sucks 2. In code hints about what will be injected 3. Not a container - the injector injects and gets out of the way The documentation is a little lacking, but that will be changing in the next few days. Examples of using snake-guice with CherryPy, Django and TurboGears are just a few days off as well. The API tests[3] show simple clear examples. The project is going to be used on several very large websites. So you can expect it to be maintained for quite a while. I would encourage you to look at each project and leave feedback where you can. It can only help each project. 0. http://code.google.com/p/snake-guice/ 1. http://code.google.com/p/pinsor/ 2. http://springpython.webfactional.com/ 3. http://code.google.com/p/snake-guice/source/browse/trunk/snakeguice/tests/test_api_25.py -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Spring-like IoC in python?
On Sun, Apr 5, 2009 at 9:24 AM, andrew cooke and...@acooke.org wrote: David Stanek wrote: [...] The documentation is a little lacking, but that will be changing in the next few days. Examples of using snake-guice with CherryPy, Django and TurboGears are just a few days off as well. The API tests[3] show simple clear examples. [...] 3. http://code.google.com/p/snake-guice/source/browse/trunk/snakeguice/tests/test_api_25.py can i make a suggestion? add comments to those tests explaining what they do in fairly boring, introductory detail (ie we are injecting a value in ... because ...). also, explain ch (class hierarchy) or, if it's just a meaningless module name, use from ... import Person because i thought it was something important and now think it's noise and if its noise it wasted my time. i know Person is the kind of class used in examples, but i am unsure if ch is something special your system needs or not. i was going to argue that ioc isn't needed in python because the motivation for it in java - that you need a more concise configuration language - doesn't exist. what's the point of using xml to simulate a scripting language when you are already in a scripting language. but maybe i have missed something, given that this stuff exists (hence me trying to understand it). That is a very good point. Up until recently I had been mostly working on getting it ready to use at work. I am only beginning my attempt to get community involvement. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Thoughts on language-level configuration support?
On Mon, Mar 30, 2009 at 9:40 AM, jfager jfa...@gmail.com wrote: I've written a short post on including support for configuration down at the language level, including a small preliminary half-functional example of what this might look like in Python, available at http://jasonfager.com/?p=440. The basic idea is that a language could offer syntactic support for declaring configurable points in the program. The language system would then offer an api to allow the end user to discover a programs configuration service, as well as a general api for providing configuration values. What value does this have over simply having a configuration file. In your load testing application you could have easily checked for the settings in a config object. I think that the discover-ability of configuration can be handled with example configs and documentation. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Thoughts on language-level configuration support?
On Tue, Mar 31, 2009 at 3:19 AM, jfager jfa...@gmail.com wrote: Simply having a configuration file - okay. What format? What if the end user wants to keep their configuration info in LDAP? Did the library I'm including make the same decisions, or do I have to do some contortions to adapt? Didn't I write basically this exact same code for the last umpteen projects I worked on, just schlepping around config objects? Ah I see your point here. During PyCon I was trying to add the ability to inject configuration into objects that are constructed by the snake-guice framework. The code is not yet in the Subversion repository, but I did brain dump a little documentation[0]. It is still very much a work in progress. 0. http://code.google.com/p/snake-guice/wiki/InjectingConfiguration -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Thoughts on language-level configuration support?
On Tue, Mar 31, 2009 at 10:01 AM, jfager jfa...@gmail.com wrote: On Mar 31, 6:02 am, David Stanek dsta...@dstanek.com wrote: On Tue, Mar 31, 2009 at 3:19 AM, jfager jfa...@gmail.com wrote: Simply having a configuration file - okay. What format? What if the end user wants to keep their configuration info in LDAP? Did the library I'm including make the same decisions, or do I have to do some contortions to adapt? Didn't I write basically this exact same code for the last umpteen projects I worked on, just schlepping around config objects? Ah I see your point here. During PyCon I was trying to add the ability to inject configuration into objects that are constructed by the snake-guice framework. The code is not yet in the Subversion repository, but I did brain dump a little documentation[0]. It is still very much a work in progress. 0.http://code.google.com/p/snake-guice/wiki/InjectingConfiguration This is getting close :) I think it would be nice if you didn't have to come up with your own names (so that projects across different authors would share more or less the same naming structure), and if those names didn't encode their expectation of a particular end-user configuration scheme. For my purpose I am writing the glue infrastructure that allows components to be put together within an application. What I am missing is a schema-like way to define configuration files. I have debated starting a project to do that, but at this time I'm already overextended :-) -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Thoughts on language-level configuration support?
On Tue, Mar 31, 2009 at 9:42 PM, Lawrence D'Oliveiro l...@geek-central.gen.new_zealand wrote: In message 36148830-22c0-4f19-ab23- d04d8755a...@s28g2000vbp.googlegroups.com, jfager wrote: I've written a short post on including support for configuration down at the language level ... If you're advocating anything resembling php.ini, you deserve to die. I am pretty sure that is uncalled for. -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: __init__ vs. __del__
2009/3/21 Randy Turner rtms...@yahoo.com: There are a number of use-cases for object cleanup that are not covered by a generic garbage collector... For instance, if an object is caching data that needs to be flushed to some persistent resource, then the GC has no idea about this. It seems to be that for complex objects, clients of these objects will need to explictly call the objects cleanup routine in some type of finally clause, that is if the main thread of execution is some loop that can terminate either expectedly or unexpectedly Relying on a generic GC is only for simple object cleanup...at least based on what I've read so far. Someone mentioned a context manager earlier...I may see what this is about as well, since I'm new to the language. If you add a .close method to your class you can use contextlib.closing[0]. I have used this to clean up distributed locks and other non-collectable resources. 0. http://docs.python.org/library/contextlib.html#contextlib.closing -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Style question - defining immutable class data members
On Sat, Mar 14, 2009 at 12:32 PM, Maxim Khitrov mkhit...@gmail.com wrote: Very simple question on the preferred coding style. I frequently write classes that have some data members initialized to immutable values. For example: class Test(object): def __init__(self): self.some_value = 0 self.another_value = None Similar effect can be achieved by defining some_value and another_value for the entire class, like so: class Test(object): some_value = 0 another_value = None The advantage of doing this is that the assignments are evaluated once and thus the creation of that class is a bit faster. Access is still performed through self.some_value and self.another_value. Is there a reason to prefer the first style over the second? In general I think it can be fine as long as you do use immutable values. I use this pattern when I create data transfer objects[0]. Normally these objects don't have any methods. So you want to be careful that you are doing it for the right reason. When I create objects that are not DTOs I don't do this. [0] http://martinfowler.com/eaaCatalog/dataTransferObject.html -- David blog: http://www.traceback.org twitter: http://twitter.com/dstanek -- http://mail.python.org/mailman/listinfo/python-list
Re: Why is lambda allowed as a key in a dict?
On Mon, Mar 9, 2009 at 11:07 PM, Daniel Fetchinson
fetchin...@googlemail.com wrote:
Python 2.5.1 (r251:54863, Oct 30 2007, 13:45:26)
[GCC 4.1.2 20070925 (Red Hat 4.1.2-33)] on linux2
Type help, copyright, credits or license for more information.
x = { }
x[lambda arg: arg] = 5
x[lambda arg: arg]
Traceback (most recent call last):
File stdin, line 1, in module
KeyError: function lambda at 0x2abaab18
Is this a case of we are all adults here? I should only blame myself
for making an unnamed function a dictionary key or should it be
forbidden? Or am I missing something completely?
Each time you are using lambda to create a new anonymous function
object. It is not giving you the same object. If you save the
reference to the lambda you can easily get it back:
l = lambda arg: arg
d= {}
d[l] = 5
d[l]
5
--
David
blog: http://www.traceback.org
twitter: http://twitter.com/dstanek
--
http://mail.python.org/mailman/listinfo/python-list
Re: PyPI editing
On Thu, Mar 5, 2009 at 3:32 AM, andrew cooke and...@acooke.org wrote: Apparently not (this will probably change, but see http://pypi.python.org/pypi/LEPL/2.0.1 which is currently displaying restructured text literally) Did you put the ReST in the description or the long_description? Take a look at the setup.py from the example you gave: http://code.google.com/p/pypp/source/browse/trunk/setup.py. Warning: I have not done this myself. -- David http://www.traceback.org -- http://mail.python.org/mailman/listinfo/python-list
Re: SVN/CVS and Branching
On Thu, Feb 19, 2009 at 7:10 AM, Jeff Dyke jeff.d...@gmail.com wrote: Fair enough. Say my project is called foo, and it has many submodules. So there are imports that may look like `import foo.bar` or `from foo.bar import baz`, if i change the top level directory, it is no longer foo and then those imports do not work as originally written. The way i currently do this is to create a branch, say foo2, and create a symbolic link named foo pointing at foo2, after renaming foo, when i want to work on the branch and remove the link when i want to work on the head. This actually works fine, but thought there may be a better way. Jeff I think that your project structure is faulty. In Subversion I do something like: * FooProject/trunk/foo * FooProject/branches/TRY-foo2 TRY-foo2 is an svn cp of trunk so checking out TRY-foo2 gives you a TRY-foo2 directory containing a foo package. My DVCS projects go essentially the same thing. -- David http://www.traceback.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Code coverage to Python code
On Sun, Jan 4, 2009 at 9:26 PM, Roy Smith r...@panix.com wrote: In article mailman.6574.1231108877.3487.python-l...@python.org, Robert Kern robert.k...@gmail.com wrote: Hussein B wrote: Hey, What is the best code coverage tool available for Python? I like Titus Brown's figleaf. http://darcs.idyll.org/~t/projects/figleaf/doc/ I was playing with Ned Batchelder's coverage.py module today. Once I stopped screwing around trying to get the easy install stuff to work and just copied the danged .py file to my site-packages directory, I was up and running in a few minutes. I suppose there's a lot of bells and whistles you could add, but it ran my code and told me which lines had executed and which hadn't. That pretty much seems like what you want a code coverage tool to do. http://nedbatchelder.com/code/modules/coverage.html It will show lines as covered when they are executed by the interpreter. Class statements, function definitions, etc. can show up as executed. Are you seeing other code show up as covered? shameless_self_promotion Recently I pushed a branch of an experimental project I am calling Barbarian[0]. It uses nose, figleaf and pylint to generate HTML for a project. A blog post with a more detailed description will be posted within a few days. [0] http://code.launchpad.net/~dstanek/+junk/Barbarian /shameless_self_promotion -- David http://www.traceback.org -- http://mail.python.org/mailman/listinfo/python-list
