[issue2892] improve cElementTree iterparse error handling
Fredrik Lundh fred...@effbot.org added the comment: Note that this was fixed in upstream 1.3 (and verified by the selftests), but the fix and test was apparently lost when that code was merged into 2.7. Since 2.7 is supposed to ship with 1.3, this is a regression, not a feature request. (But 2.7 is in rc, and I'm on vacation, so I guess it's a bit too late to do anything about that. I'll leave the final decision to flox and the python-dev crowd.) -- assignee: effbot - flox versions: +Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2892 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8583] Hardcoded namespace_separator in the cElementTree.XMLParser
Fredrik Lundh fred...@effbot.org added the comment: Namespaces are a fundamental part of the XML information model (both xpath and infoset) and all modern XML document formats, so I'm not sure what problem you're trying to solve by pretending that they don't exist. It's a bit like modifying import foo to work like from foo import *... -- nosy: +effbot ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8583 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6488] ElementTree documentation refers to path with no explanation, and inconsistently
Fredrik Lundh fred...@effbot.org added the comment: As per PEP 257, “Returns” should become “Return” (it’s a command, not a description). Upstream ET uses JavaDoc conventions, where the conventions are designed by technical writers, not hackers. In JavaDoc, descriptions are 3rd person declarative (after all, the documentation describes what the function does, not what you want it to do). http://java.sun.com/j2se/javadoc/writingdoccomments/ The incompatibilities with Python's NIH-standards are unfortunate, but that's the way it is. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6488 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6488] ElementTree documentation refers to path with no explanation, and inconsistently
Fredrik Lundh fred...@effbot.org added the comment: The missing/extra words in the findtext description is just a case of sloppy copy-editing, most likely after a quick reformatting. Not sure why you're spending all this energy arguing about commas, though. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6488 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: Hmm. I'm not entirely sure about giving False a meaning when None has traditionally had a different (and documented) meaning. And sleeping on it hasn't convinced me in either direction :-( (well, I'd say no, but the compatibility argument is somewhat tempting) I'm not that concerned by changing the default for write -- 3.x users with utf-8 as the default output encoding will get different output, but still perfectly valid XML. 3.x users with non-utf-8 default encodings will get valid XML also in cases where it didn't work before. tostring() is more problematic, but I'm leaning towards Guido's torpedoes approach there -- changing the default output to bytestrings is more likely to cause code to blow up than cause bad output, and you can trivially make your program backwards compatible by adding an extra check/decode after the call. Supporting unicode for lxml.etree compatibility is fine with me, but I think it might make sense to support the string unicode as well (as a pseudo-encoding -- it's pretty clear to me that nobody will ever define a real character encoding with that name :-). Have you posted/can you post the patch to riedveld, btw? I have some questions about the code that are independent of the encoding decision. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: 'None' has always been the documented default for the encoding parameter That's probably mostly by accident at least in original ET, but the 1.3 draft docs at effbot.org/elementtree does spell it out explicitly for the 'write' method: Output encoding. If omitted or set to None, defaults to US-ASCII. Not sure I'd consider this text binding in itself, though (even if I'd argue that it's preferred to have the same interpretation of encoding everywhere). writing out the Unicode serialisation will result in an incorrect XML serialisation I think Guido meant the ElementTree.write method; is that broken too? The file.write(et.tostring()) issue is probably my most pressing concern here; that's a common use case (e.g. when using iterparse to cut pieces from a big document), and the defaults were chosen to increase the chance that this automatically do the right thing for non-ASCII even if the programmer never tests it. In 3.X, that construct is suddenly dependent on the interpreter's default encoding. I think I'd prefer old tostring behaviour and a separate tounicode function, and I'm still not convinced that the latter is required for the XML use case (which implies that maybe it should live in lxml.html for the HTML case, even if it ends up calling the same internal implementation). Or should that be tobytes and tounicode to eliminate all ambiguity? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: (what's the Python 3 replacement for the array module, btw?) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: Yes, the feature has been implemented deep down in the _encode() helper function, so it impacts the entire serialiser, not only its API Ouch. import locale locale.getpreferredencoding() == utf-8 False from xml.etree.ElementTree import * e = Element(tag) e.text = hellö tostring(e) 'taghellö/tag' ElementTree(e).write(out.xml) tree = parse(out.xml) Traceback (most recent call last): File stdin, line 1, in module File C:\Python31\lib\xml\etree\ElementTree.py, line 843, in parse tree.parse(source, parser) File C:\Python31\lib\xml\etree\ElementTree.py, line 581, in parse parser.feed(data) File C:\Python31\lib\xml\etree\ElementTree.py, line 1221, in feed self._parser.Parse(data, 0) xml.parsers.expat.ExpatError: not well-formed (invalid token): line 1, column 9 -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: I wouldn't raise much opposition against tobytes() as an alias for tostring(), although that sounds more like duplicating an otherwise simple API. Adding an alias would be a way address the 2.X/3.X terminology overlap; string traditionally implies 8-bit in 2.X, and apparently now Unicode in 3.X. That's likely to cause a lot of confusion for people switching over (and to people writing 3.X documentation, as well; the array module's documentation is an example). ET isn't the only thing with tostring functionality, of course -- it's pretty much the standard name for serialize data structure to byte string for later transmission -- so it probably wouldn't hurt with a python-dev pronouncement here. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Changes by Fredrik Lundh fred...@effbot.org: -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: I wouldn't raise much opposition against tobytes() as an alias for tostring(), although that sounds more like duplicating an otherwise simple API. Adding an alias would be a way address the 2.X/3.X terminology overlap; string traditionally implies 8-bit in 2.X, and apparently now Unicode in 3.X. That's likely to cause a lot of confusion for people switching from 2 to 3 (and to people writing 3.X documentation, apparently; the array module's documentation is an example of that). (And once everyone has switched over, we can deprecate the tostring spelling... :) ET isn't the only thing with tostring functionality, of course -- it's pretty much the standard name for serialize data structure to byte string for later transmission -- so it probably wouldn't hurt with a python-dev pronouncement here. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: Interesting. But isn't the problem with 3.1 that it relies on the standard encoding, which results in code that may or may not work depending on a global platform setting? Who's doing the encoding in the new version? And what ends up in the file? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: Oops :) Yeah, that was pretty lousy way to show what encoding I was using for that test: import locale locale.getpreferredencoding() 'cp1252' (Somewhat related, it would be nice if Python actually normalized defaultencoding/preferredencoding to some canonical name for the codec in use, i.e. preferred MIME name or at least IANA; we had a rather nice little bug recently that wouldn't have happened if that had been the case...) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7114] HTMLParser doesn't handle ![CDATA[ ... ]]
Fredrik Lundh fred...@effbot.org added the comment: And to clarify, XHTML is an reformulation of HTML4 using XML syntax, so you should use an XML parser to parse it, not an HTML parser. The formats are related, but not identical. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7114 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5100] ElementTree.iterparse and Element.tail confusion
Fredrik Lundh fred...@effbot.org added the comment: Footnote: iterparse does things this way mostly to keep the implementation simple and fast; due to buffering, the tree builder are usually ahead of the event generation with up to 16k. See the note on this page: http://effbot.org/zone/element-iterparse.htm and the message it links to for more on this topic. Your case is a very common use case for tostring, so it would probably have made sense to make tostring skip the tail on the element itself, at least if it's whitespace only. Guess we could add an option... But in your case, you can probably just nuke or normalize the tail element before writing it out (i.e. set it to None or \n). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5100 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: if I don't specify an encoding, I get unicode. If I do specify an encoding, I get encoded bytes. You're confusing the XML document encoding with character set encoding. A serialized (unparsed) XML document is a byte stream, not a string of Unicode characters. And the character set encoding is both embedded in that byte stream and affects how it's generated in more than one way; you cannot just recode XML documents nilly willy and expect things to work. A parsed XML document (an infoset) -- for ET, that's the tree of Element objects -- does indeed contain Unicode strings, but the transformation from the byte stream to the Unicode string doesn't just involve character set decoding; there are several other constructs that are handled by the XML parser. Ha. There has been a very long temporal window You should have had plenty of time to fix it, then, right? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6472] Update ElementTree with upstream changes
Fredrik Lundh fred...@effbot.org added the comment: W00t! -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6472 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: import array array.array(i, [1, 2, 3]).tostring() b'\x01\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00' -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8047] Serialiser in ElementTree returns unicode strings in Py3k
Fredrik Lundh fred...@effbot.org added the comment: So now it's the domain experts against some hypothetical people that might exist? Tricky. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8047 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7462] Implement fastsearch algorithm for rfind/rindex
Fredrik Lundh fred...@effbot.org added the comment: Thanks Florent! Are there any simple, common cases that are made slower by this patch? The original fastsearch implementation has a couple of special cases to make sure it's faster than the original code in all cases. The reason it wasn't implemented for reverse search was more a question of developer time constraints; reverse search isn't nearly as common as forward search, and we had other low-hanging fruit to deal with. (btw, while it's great that someone finally got around to fix this, it wouldn't surprise me if replacing the KMP implementation in SRE with a fastsearch would save as many CPU cycles worldwide as this patch :) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7462 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3475] _elementtree.c import can fail silently
Fredrik Lundh fred...@effbot.org added the comment: Note that fail silently is a bit of a misnomer - if the embedded import doesn't work, portions of the library will fail pretty loudly. Feel free to use some variation of the suggested patch, or just wait until the next upstream release gets imported (if ever). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue3475 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7139] ElementTree: Incorrect serialization of end-of-line characters in attribute values
Fredrik Lundh fred...@effbot.org added the comment: The real problem here is that XML attributes weren't really designed to hold data that doesn't survive normalization. One would have thought that making it difficult to do that, and easy to store such things as character data, would have made people think a bit before designing XML formats that does things the other way around, but apparently some people finds it hard having to use their brain when designing things... FWIW, the current ET 1.3 beta escapes newline but not tabs and carriage returns; I don't really mind adding tabs, but I'm less sure about carriage return -- XML pretty much treats CT as a junk character also outside attributes, and escaping it in all contexts would just be silly. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7139 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: [Image-SIG] Some issue with easy_install and PIL/Imaging
The problem is that too many people arguing for eggs do this by sending nastygrams, which doesn't really provide much motivation for doing anything about it (I don't do asshole-driven development). The public review PIL got a couple a minutes ago matches some of the private mail I've gotten: no egg - worst seen ever, remove it from pypi or provide an egg (jensens, 2009-10-05, 0 points) /F On Wed, Sep 30, 2009 at 6:24 PM, Chris Withers ch...@simplistix.co.uk wrote: Fredrik Lundh wrote: On Fri, Sep 11, 2009 at 3:49 PM, Chris Withers ch...@simplistix.co.uk wrote: Klein Stéphane wrote: Resume : 1. first question : why PIL package in pypi don't work ? Because Fred Lundh have his package distributions unfortunate names that setuptools doesn't like... It used to support this, but no longer does. To me, that says more about the state of setuptools than it does about the state of PIL, which has been using the same naming convention for 15 years. Yep, but it is now in the minority, and consistency in package naming is always good. Would there be any problems for you in naming the distribution in a setuptools-friendly way from the next point release? cheers, Chris -- Simplistix - Content Management, Batch Processing Python Consulting - http://www.simplistix.co.uk -- http://mail.python.org/mailman/listinfo/python-list
Re: [Image-SIG] Some issue with easy_install and PIL/Imaging
On Fri, Sep 11, 2009 at 3:49 PM, Chris Withers ch...@simplistix.co.uk wrote: Klein Stéphane wrote: Resume : 1. first question : why PIL package in pypi don't work ? Because Fred Lundh have his package distributions unfortunate names that setuptools doesn't like... It used to support this, but no longer does. To me, that says more about the state of setuptools than it does about the state of PIL, which has been using the same naming convention for 15 years. /F -- http://mail.python.org/mailman/listinfo/python-list
[issue6562] OverflowError in RLock.acquire()
Fredrik Lundh fred...@effbot.org added the comment: PIL is completely thread-agnostic, so I not sure there's anything PIL can do to fix this. (and ImageQt is of course an interface to PyQt, which is an interface to Qt, which consists of a *lot* more than 50 lines...) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6562 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6233] ElementTree (py3k) doesn't properly encode characters that can't be represented in the specified encoding
Fredrik Lundh fred...@effbot.org added the comment: That's backwards, unless I'm missing something here: charrefs represent Unicode characters, not UTF-8 byte values. The character LATIN SMALL LETTER A WITH TILDE with the character value 227 should be represented as #227; if serialized to an encoding that doesn't support non-ASCII characters. And there's no need to use RE:s to filter things under 3.X; those parts of ET 1.2 are there for pre-2.0 compatibility. Did you try running the tests with the escape function I posted? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6233 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5166] ElementTree and minidom don't prevent creation of not well-formed XML
Fredrik Lundh fred...@effbot.org added the comment: For ET, that's very much on purpose. Validating data provided by every single application would kill performance for all of them, even if only a small minority would ever try to serialize data that cannot be represented in XML. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5166 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6266] cElementTree.iterparse ElementTree.iterparse return differently encoded strings
Fredrik Lundh fred...@effbot.org added the comment: It should definitely give what's intended (either a Unicode string, or, if the content is plain ASCII, an 8-bit string). What did you get instead? -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6266 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6233] ElementTree (py3k) doesn't properly encode characters that can't be represented in the specified encoding
Fredrik Lundh fred...@effbot.org added the comment: Umm. Isn't _encode used to encode tags and attribute names? The charref syntax is only valid in CDATA sections and attribute values, which are encoded by the corresponding _escape functions. I suspect this patch will make things blow up on a non-ASCII tag/attribute name. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6233 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6233] ElementTree (py3k) doesn't properly encode characters that can't be represented in the specified encoding
Fredrik Lundh fred...@effbot.org added the comment: Did you look at the 1.3 alpha code base when you came up with this idea? Unfortunately, 1.3's _encode is used for a different purpose... I don't have time to test it tonight, but I suspect that 1.3's escape_data/escape_attrib functions might work better under 3.X; they do the text.replace dance first, and then an explicit text.encode(encoding, xmlcharrefreplace) at the end. E.g. def _escape_cdata(text, encoding): # escape character data try: # it's worth avoiding do-nothing calls for strings that are # shorter than 500 character, or so. assume that's, by far, # the most common case in most applications. if in text: text = text.replace(, amp;) if in text: text = text.replace(, lt;) if in text: text = text.replace(, gt;) return text.encode(encoding, xmlcharrefreplace) except (TypeError, AttributeError): _raise_serialization_error(text) -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6233 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue6266] cElementTree.iterparse ElementTree.iterparse return differently encoded strings
Fredrik Lundh fred...@effbot.org added the comment: Converting from UTF-8 to Unicode is the right thing to do, but converting back to Latin-1 is not correct -- note that ET returns a Unicode string, not an 8-bit string. There's a makestring helper that does the right thing in the library; just changing: parcel = Py_BuildValue(ss, (prefix) ? prefix : , uri); to parcel = Py_BuildValue(sN, (prefix) ? prefix : , makestring(uri)); should work (even if you should probably do that in two steps, and look for errors from makestring before proceeding). -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue6266 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue5767] xmlrpclib loads invalid documents
Fredrik Lundh fred...@effbot.org added the comment: sgmlop doesn't do much validation; to quote the homepage: [sgmlop] is tolerant, and happily accepts XML-like data that are not well-formed. If you need strictness, use another parser. But given that Python ships with cElementTree these days, and cElementTree's XMLParser (based on expat) is faster than both sgmlop and pyexpat, maybe it's time to remove sgmlop support from xmlrpclib... -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue5767 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1143] Update to latest ElementTree in Python 2.7
Fredrik Lundh eff...@users.sourceforge.net added the comment: ET 1.3 is still in alpha, though. Hopefully, that'll sort itself out over the next few weeks. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1143 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1538691] Patch cElementTree to export CurrentLineNumber
Fredrik Lundh eff...@users.sourceforge.net added the comment: In the upstream 1.0.6, the ParseError exception has a position attribute that contains a (line, column) tuple. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1538691 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1777] ElementTree/cElementTree findtext inconsistency
Fredrik Lundh eff...@users.sourceforge.net added the comment: Forgot to mention that this is fixed in the cElementTree trunk (public as of today's 1.0.6 preview release). Will merge with Python trunk when I find the time... ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue1777 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Official definition of call-by-value (Re: Finding the instance reference...)
greg wrote: If you're going to indulge in argument by authority, you need to pick authorities that can be considered, er, authoritative in the field concerned... Like Barbara Liskov, who's won tons of awards for her work on computer science and programming languages, and who was among the first to design, implement, and formally describe a language with *exactly* the same evaluation semantics as Python? What did she and her co-authors have to say about the calling semantics in their new language? Let's see: In particular it is not call by value because mutations of arguments performed by the called routine will be visible to the caller. And it is not call by reference because access is not given to the variables of the caller, but merely to certain objects. Let's take that again, with emphasis: IN PARTICULAR IT IS NOT CALL BY VALUE because mutations of arguments performed by the called routine will be visible to the caller. And IT IS NOT CALL BY REFERENCE because access is not given to the variables of the caller, but merely to certain objects. It is not. And it is not. But maybe they were just ignorant, and didn't really get how earlier languages worked? Let's see what Liskov has to say about that: The group as a whole was quite knowledgeable about languages that existed at the time. I had used Lisp extensively and had also programmed in Fortran and Algol 60, Steve Zilles and Craig Schaffert had worked on PL/I compilers, and Alan Snyder had done extensive programming in C. In addition, we were familiar with Algol 68, EL/1, Simula 67, Pascal, SETL, and various machine languages. Early in the design process we did a study of other languages to see whether we should use one of them as a basis for our work [Aiello, 1974]. We ultimately decided that none would be suitable as a basis. None of them supported data abstraction, and we wanted to see where that idea would lead us without having to worry about how it might interact with pre-existing features. However, we did borrow from existing languages. Our semantic model is largely borrowed from Lisp; our syntax is Algol-like. Still think they didn't understand Algol's semantic model? ::: But nevermind - the real WTF with threads like this one is the whole idea that there are two and only two evaluation strategies to choose from. That's a remarkable narrow-mindedness. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Official definition of call-by-value (Re: Finding the instance reference...)
Aahz wrote: There you have it -- call by value is offially defined in terms of assignment. There is no mention in there of copying. So it's perfectly correct to use it in relation to Python. Except, of course, for the fact that it is generally misleading. It's not only misleading, it's also a seriously flawed reading of the original text - the Algol 60 report explicitly talks about assignment of *values*. I'm not aware of any language where a reference to an object, rather than the *contents* of the object, is seen as the object's actual value. It's definitely not true for Python, at least. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Official definition of call-by-value (Re: Finding the instance reference...)
greg wrote: It's not only misleading, it's also a seriously flawed reading of the original text - the Algol 60 report explicitly talks about assignment of *values*. Do you agree that an expression in Python has a value? Do you agree that it makes sense to talk about assigning that value to something? Python's definition of the word value can be found in the language reference: http://docs.python.org/reference/datamodel.html#objects-values-and-types Using that definition, a Python expression yields an object, not an object value. For comparison, here's Algol's definition of the word value: A value is an ordered set of numbers (special case: a single number), an ordered set of logical values (special case: a single logical value), or a label. It should be obvious to anyone that Python is not Algol. If so, what is there to stop us from applying the Algol definition to Python? The fact that we're talking about Python. Python is not Algol. /F -- http://mail.python.org/mailman/listinfo/python-list
[issue4100] xml.etree.ElementTree does not read xml-text over page bonderies
Fredrik Lundh [EMAIL PROTECTED] added the comment: Roland's right - iterparse only guarantees that it has seen the character of a starting tag when it emits a start event, so the attributes are defined, but the contents of the text and tail attributes are undefined at that point. The same applies to the element children; they may or may not be present. If you need a fully populated element, look for end events instead. ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue4100 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Using the 'with' statement with cStringIO objects
peppergrower wrote: teststring='this is a test' with cStringIO.StringIO(teststring) as testfile: pass umm. what exactly do you expect that code to do? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to read a jpg bytearray from a Flash AS3 file
[EMAIL PROTECTED] wrote: I'm trying to save an image from a Flash AS3 to my server as a jpg file. I found some PHP code to do this, but I want to do this in Python. I'm not quite sure how to convert the following code to Python. It's mainly the $GLOBALS[HTTP_RAW_POST_DATA] part I don't know how to convert. depends on what framework you're using. if you're using plain CGI, you should be able to read the posted data from sys.stdin: import sys im = sys.stdin.read() f = open(name, 'wb') f.write(jpg) f.close() to make your code a bit more robust, you may want to check the content-length before doing the read, e.g. import os if os.environ.get(REQUEST_METHOD) != POST: ... report invalid request ... bytes = int(os.environ.get(CONTENT_LENGTH, 0)) if bytes MAX_REQUEST_SIZE: ... report request too large ... im = sys.stdin.read(bytes) to deal with query parameters etc, see http://docs.python.org/lib/module-cgi.html /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the filename in the right case ?
Stef Mientki wrote: I don't think your suggestion is a good one. If a filename has uppercase characters in it, the END-USER has done that for some kind of reason. I explain how pdb works and show you how to solve the specific comparison problem you mentioned in your post, and you start ranting because it doesn't solve all your problems? what's wrong with you? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Regular expression help: unable to search ' # ' character in the file
[EMAIL PROTECTED] wrote: import re fd = open(file, 'r') line = fd.readline pat1 = re.compile(\#*) while(line): mat1 = pat1.search(line) if mat1: print line line = fd.readline() I strongly doubt that this is the code you used. But the above prints the whole file instead of the hash lines only. * means zero or more matches. all lines is a file contain zero or more # characters. but using a RE is overkill in this case, of course. to check for a character or substring, use the in operator: for line in open(file): if # in line: print line /F -- http://mail.python.org/mailman/listinfo/python-list
[issue433029] SRE: posix classes aren't supported
Fredrik Lundh [EMAIL PROTECTED] added the comment: Yes, this refers to the POSIX character classes as described here: http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap09.html (Ideally, there should be an (internal) API that lets you register class definitions from the Python level.) Support for Unicode properties could perhaps be addressed at the same time: http://unicode.org/unicode/reports/tr18/#Basic_Unicode_Support ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue433029 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Eggs, VirtualEnv, and Apt - best practices?
Dmitry S. Makovey wrote: you have just described OS package building ;) I can't speak for everybody, but supporting multiple platforms (PHP, Perl, Python, Java) we found that the only way to stay consistent is to use OS native packaging tools (in your case apt and .deb ) and if you're missing something - roll your own package. After a while you accumulate plenty of templates to chose from when you need yet-another-library not available upstream in your preferred package format. Remember that some python tools might depend on non-python packages, so the only way to make sure all that is consistent across environment - use unified package management. you're speaking for lots of organizations, at least. rpm/debs from supplier's repository subversion (or equivalent) - locally built rpm/debs + organization's favourite deployment tools - deployed application /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to get the filename in the right case ?
Stef Mientki wrote: 1. I've a multitab editor. 2. When a breakpoint is reached, 3. I check if the file specified in pdb output, is already open in one of the editor tabs, 4. if not, I open a new tab with the correct file, 5. I focus the correct editor tab and jump to the line specified by pdb. 6. After that I should be able to inspect the surrounding of the breakpoint, so I need the modules name. For 3 I need to compare filenames, the editor contains the case sensitive name, pdb not. pdb uses os.path.abspath and os.path.normcase to normalize filenames so they can be safely compared (see the canonic method in bdb.py). I suggest you do the same in your editor; e.g: pdb_filename = ... for buffer in editor_buffers: filename = os.path.normcase(os.path.abspath(buffer.filename)) if pdb == filename: ... found it ... break /F -- http://mail.python.org/mailman/listinfo/python-list
[issue3547] Ctypes is confused by bitfields of varying integer types
Fredrik Lundh [EMAIL PROTECTED] added the comment: Looks fine to me, except for the comment in the test suite. Should +# MS compilers do NOT combine c_short and c_int into +# one field, gcc doesn't. perhaps be +# MS compilers do NOT combine c_short and c_int into +# one field, gcc do. ? Is using explicit tests for MSVC vs. GCC a good idea, btw? What about other compilers? Can the test be changed to accept either value? -- nosy: +effbot ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3547 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3547] Ctypes is confused by bitfields of varying integer types
Fredrik Lundh [EMAIL PROTECTED] added the comment: Do should be does, right. Not enough coffee today :) ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3547 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Why are broken iterators broken?
Cameron Simpson wrote: you probably want the consumer thread to block when it catches up with the producer, rather than exit. It sounds like he wants non-blocking behaviour in his consumer. Roy gave an example, he didn't post a requirements specification. A common example is try to gather a lot of stuff into a single packet, but send a smaller packet promptly if there isn't much stuff. that use case is better solved with a plain list object. no need to make things harder than they are. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Regex Help
Support Desk wrote:
the code I am using is
regex = r'a href=[|\']([^|\']+)[|\']'
that's way too fragile to work with real-life HTML (what if the link has
a TITLE attribute, for example? or contains whitespace after the HREF?)
you might want to consider using a real HTML parser for this task.
page_text = urllib.urlopen('http://somesite.com')
page_text = page_text.read()
links = re.findall(regex, text, re.IGNORECASE)
the RE looks fine for the subset of all valid A elements that it can
handle, though.
got any examples of pages where you see that behaviour?
/F
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Re: Here's something interesting: sympy crashes in Python 2.6 (Windows)
Robert Kern wrote: No warnings show up when importing the offending module: Python 2.5.1 (r251:54869, Apr 18 2007, 22:08:04) [GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin Type help, copyright, credits or license for more information. from sympy.mpmath import specfun So what could be suppressing the warning? a bug in Python 2.5, it seems: more f1.py as = 1 as = 2 as = 3 python f1.py f1.py:1: Warning: 'as' will become a reserved keyword in Python 2.6 f1.py:2: Warning: 'as' will become a reserved keyword in Python 2.6 f1.py:3: Warning: 'as' will become a reserved keyword in Python 2.6 more f2.py as = 1 import os as = 3 python f2.py f2.py:1: Warning: 'as' will become a reserved keyword in Python 2.6 A quick look in parsetok.c reveals that it sets a handling_import flag when it stumbles upon an import statement, a flag that's later used to suppress the warning message. The bug is that the flag isn't reset until the parser sees an ENDMARKER token (end of file), instead of when it sees the next NEWLINE token. (if someone wants to submit this to bugs.python.org, be my guest) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Tkinter 3000 WCK Install Problem
garyr wrote: I'm trying to install WCK. I downloaded and installed the Windows executable for my Python version. It appeared to run OK. I then downloaded the demo files but find that none run due to error: ImportError: No module named _tk3draw. I'm using ActivePython 2.3.5 on Windows XP Home. What can I do to fix this problem? the error means that the interpreter cannot find the _tk3draw.pyd file. if you use the standard install location, it should be installed under C:\Python23\lib\site-packages you could try this: import FixTk import _tk3draw _tk3draw.__file__ 'C:\\Python23\\lib\\site-packages\\_tk3draw.pyd' if this also gives you an error, search for _tk3draw.pyd on the disk. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Not fully OO ?
Martin v. Löwis wrote: I don't think he meant that Python is wrong somehow, but that the OO babble of what happens for 2+2 is wrong. The babble said that, when the code is executed, an __add__ message is sent to the 2 object, with another 2 object as the parameter. That statement is incorrect: no message is sent at all, but the result is available even before the program starts. On the other hand, the inability to distinguish between as if and hah, I've looked under the covers isn't necessarily a good trait for a programmer. If he bases his mental model on concrete implementation details of a production quality software product, he's bound to end up with a cargo-cultish understanding of fundamental issues. If he uses it to win arguments, people will flip his bozo bit pretty quickly. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to kill threading.Thread instance?
dmitrey wrote: BTW, it should be noticed that lots of threading module methods have no docstrings (in my Python 2.5), for example _Thread__bootstrap, _Thread__stop. things named _Class__name are explicitly marked private by the implementation (using the __ prefix). using them just because you can find them via dir is a really stupid idea. (and, as noted in the comment section to the recipe, the stop method flags a thread as stopped, it doesn't stop it.) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to kill threading.Thread instance?
Diez B. Roggisch wrote: I wonder why something like myThread.exit() or myThread.quit() or threading.kill(myThread) can't be implemented? Is something like that present in Python 3000? Not that I'm aware of it (which doesn't mean to much though). However I *am* aware of the bazillions discussions that have been held over this here - and the short answer is: it is a generally very bad idea to terminate threads hard, as it can cause all kinds of corruption. the problem is that you have no idea what the thread is doing, so just killing it dead it may make one big mess out of the application's internal state; see e.g. this post http://mail.python.org/pipermail/python-list/2006-August/400256.html That's wise ;-) Stopping a thread asynchronously is in /general/ a dangerous thing to do, and for obvious reasons. For example, perhaps the victim thread is running in a library routine at the time the asynch exception is raised, and getting forcibly ejected from the normal control flow leaves a library-internal mutex locked forever. Or perhaps a catch-all finally: clause in the library manages to release the mutex, but leaves the internals in an inconsistent state. which links to a FAQ from Sun on this very topic: http://java.sun.com/j2se/1.3/docs/guide/misc/threadPrimitiveDeprecation.html (note that Java releases all mutexes when a thread is killed, but that's not much better, as the FAQ explains) so as usual, the right thing to do is to do things in the right way. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Override the '+' symbol
Mr.SpOOn wrote: how can I override the '+' symbol (and other math symbols) so that it can have a new behavior when applied to some objects? see Emulating Numeric Types in the language reference: http://www.python.org/doc/ref/numeric-types.html /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Why are broken iterators broken?
Steven D'Aprano wrote: According to the Python docs, once an iterator raises StopIteration, it should continue to raise StopIteration forever. Iterators that fail to behave in this fashion are deemed to be broken: http://docs.python.org/lib/typeiter.html I don't understand the reasoning behind this. As I understand it, an iterator is something like a stream. There's no constraint that once a stream is empty it must remain empty forever. it's a design guideline, not an absolute rule. but I disagree that an iterator is something like a stream. it's rather something like a pointer or an index, that is, an object that helps you iterate over all members in a collection. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Why are broken iterators broken?
Roy Smith wrote: There are plausible examples of collections which grow while you're iterating over them. I'm thinking specifically of a queue in a multi-threaded application. One thread pushes work onto the back of the queue while another pops from the front. The queue could certainly go empty at times. But, maybe a Python iterator is just the wrong way to model such behavior. you probably want the consumer thread to block when it catches up with the producer, rather than exit. (that's the default behaviour of Python's Queue object, btw) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Newick parser
aditya shukla wrote: Hello folks , i have a .nwk file.I want to parser the tree from that file.I found this python parser for newick trees. http://www.daimi.au.dk/~mailund/newick.html But i don't understand the usage properly.What i wanna do is if i have a file in the location c:\\files\\file1.nwk , then i wanna parse the trees in that file. judging from the docs, you should be able to do e.g. from newick import parse_tree file = open(c:\\files\\file1.nwk) text = file.read() print parse_tree(text) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: report a BUG of package setuptools-0.6c8.
为爱而生 wrote: File /usr/lib/python2.5/site-packages/setuptools/command/sdist.py, line 98, in entries_finder log.warn(unrecognized .svn/entries format in %s, dirname) NameError: global name 'log' is not defined global name 'log' is not defined to the line 98!!! please report bugs here: http://bugs.python.org/ /F -- http://mail.python.org/mailman/listinfo/python-list
Re: The Python computer language
ROSEEE wrote: http://pthoncomputerlanguage.blogspot.com report here: http://tinyurl.com/blogspot-spam /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Not fully OO ?
Kay Schluehr wrote: Answer: if you want to define an entity it has to be defined inside a class. If you want to access an entity you have to use the dot operator. Therefore Java is OO but Python is not. you're satirising the quoted author's cargo-cultish view of object orientation, right? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Not fully OO ?
Colin J. Williams wrote: foreach: for x in array: statements Loops over the array given by array. On each iteration, the value of the current element is assigned to x and the internal array pointer is advanced by one. This could be a useful addition to Python. for-in could be a useful addition to Python? looks like Guido's used his time machine again, then, since it's been around since the pre-1.0 days: http://www.python.org/doc/ref/for.html /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to make a reverse for loop in python?
Alex Snast wrote: I'm new to python and i can't figure out how to write a reverse for loop in python e.g. the python equivalent to the c++ loop for (i = 10; i = 0; --i) use range with a negative step: for i in range(10-1, -1, -1): ... or just reverse the range: for i in reversed(range(10)): ... (the latter is mentioned in the tutorial, and is the second hit if you google for python reverse for loop) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to make a reverse for loop in python?
Fredrik Lundh wrote: e.g. the python equivalent to the c++ loop for (i = 10; i = 0; --i) use range with a negative step: for i in range(10-1, -1, -1): ... or just reverse the range: for i in reversed(range(10)): ... (and to include the 10 in the range, add one to the 10 above) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: NEW GENERATED DLL ERROR FOUND WITHIN f2PY.py
Blubaugh, David A. wrote: (no need to shout when filling in the subject line, thanks) I have now been able to generate a .pyd file from a FORTRAN file that I am trying to interface with python. I was able to execute this with an additional insight into how f2py operates. ImportError: DLL load with error code 193 Error code 193 is ERROR_BAD_EXE_FORMAT, which means that the thing you're trying to import is not a proper DLL. copy LICENSE.txt LICENSE.pyd 1 file(s) copied. python import LICENSE Traceback (most recent call last): File stdin, line 1, in module ImportError: DLL load failed with error code 193 In general, the tools for building binary extensions for Python assumes that you have at least some basic knowledge about how to build binaries using a compiled language. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to Determine Name of the Day in the Week
Keo Sophon wrote: I've tried calendar.month_name[0], it displays empty string, while calendar.month_name[1] is January? Why does calendar.month_name's index not start with index 0 as calendar.day_name? the lists are set up to match the values used by the time and datetime modules; see e.g. http://docs.python.org/lib/module-time.html http://docs.python.org/lib/datetime-date.html /F -- http://mail.python.org/mailman/listinfo/python-list
Re: PEP proposal optparse
James Mills wrote: As you can see (as long as you're reading this in fixed-width fonts) it _is_ very readable. given that it only relies on indentation from the left margin, it's no less readable in a proportional font (unless you're using an font with variable-width spaces, that is ;-). /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Twisted vs Python Sockets
James Matthews wrote: I am wondering what are the major points of twisted over regular python sockets. I am looking to write a TCP server and want to know the pros can cons of using one over the other. Twisted is a communication framework with lots of ready-made components: http://twistedmatrix.com/trac/wiki/TwistedAdvantage Regular sockets are, well, regular sockets. No more, no less. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Extracting hte font name from a TrueType font file
Steve Holden wrote: Does anyone have a Python recipe for this? from PIL import ImageFont f = ImageFont.truetype(/windows/fonts/verdanai.ttf, 1) f.font.family 'Verdana' f.font.style 'Italic' /F -- http://mail.python.org/mailman/listinfo/python-list
Re: how many objects are loaded for hello world?
belred wrote: i just read this blog about how many objects (types) are loaded for a hello world program in C#. http://blogs.msdn.com/abhinaba/archive/2008/09/15/how-many-types-are-loaded-for-hello-world.aspx how can you find out how many are loaded for a python program: print 'hello' types and objects are different things, though. to get an idea of how much stuff Python loads using upstart, do python -vv script.py or add import sys print len(sys.modules), modules print sys.modules.keys() to the end of the script. to get an idea of how many objects and types that are created at that point, add import gc print len(gc.get_objects()), objects print len(set(map(type, gc.get_objects(, types this gives me 35 modules (including the gc module), 3219 objects and 26 distinct types -- but the above will miss things, so the true numbers are a bit higher. (you might be able to use a debug build to get more detailed information) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: File Reading related query
Usman Ajmal wrote: Is there any function for reading a file while ignoring *\n* occuring in the file? can you be a bit more precise? are we talking about text files or binary files? how do you want to treat any newlines that actually appear in the file? /F -- http://mail.python.org/mailman/listinfo/python-list
Re: recursive using the os.walk(path) from the os module
A. Joseph wrote: I want to search through a directory and re-arrange all the files into e.g All .doc files go into MS WORD folder, all .pdf files goes into PDF Folder. I`m thinking of doing something with the os.walk(path) method from os module, I need some ideal how the algorithm should look like, maybe recursive ..any deal? os.walk traverses the directory tree, so I'm not sure why you think that your program needs to use recursion? wouldn't a plain loop work? import os, shutil for dirpath, dirnames, filenames in os.walk(directory): for name in filenames: source = os.path.join(dirpath, name) ... check extension and determine target directory ... destination = os.path.join(targetdir, name) shutil.move(source, destination) tweak as necessary. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: python regex character group matches
christopher taylor wrote:
my issue, is that the pattern i used was returning:
[ '\\uAD0X', '\\u1BF3', ... ]
when i expected:
[ '\\uAD0X\\u1BF3', ]
the code looks something like this:
pat = re.compile((\\\u[0-9A-F]{4})+, re.UNICODE|re.LOCALE)
#print pat.findall(txt_line)
results = pat.finditer(txt_line)
i ran the pattern through a couple of my colleagues and they were all
in agreement that my pattern should have matched correctly.
First, [0-9A-F] cannot match an X. Assuming that's a typo, your next
problem is a precedence issue: (X)+ means one or more (X), not one or
more X inside parens. In other words, that pattern matches one or more
X's and captures the last one.
Assuming that you want to find runs of \u escapes, simply use
non-capturing parentheses:
pat = re.compile(u(?:\\\u[0-9A-F]{4}))
and use group(0) instead of group(1) to get the match.
/F
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Re: python regex character group matches
Steven D'Aprano wrote:
Assuming that you want to find runs of \u escapes, simply use
non-capturing parentheses:
pat = re.compile(u(?:\\\u[0-9A-F]{4}))
Doesn't work for me:
pat = re.compile(u(?:\\\u[0-9A-F]{4}))
it helps if you cut and paste the right line... here's a better version:
pat = re.compile(r(?:\\u[0-9A-F]{4})+)
/F
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Re: translating ascii to binary
Lie wrote: Any advice about this matter would be very appreciated. Thanks in advance. It'd be easier to make a one-char version of ascii2bin then make the string version based on the one-char version. And it'd be a lot easier to read your posts if you trimmed away at least some of the original message before posting. If you cannot do that for some technical reason, I recommend using top-posting instead. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: python-mode problem, doesnt load whole module?
cnb wrote: a = parsing.unserialize(C:/users/saftarn/desktop/twok.txt) Traceback (most recent call last): File C:\Python25\lib\pickle.py, line 1126, in find_class klass = getattr(mod, name) when reporting a traceback, please include the error message that follows after the stack trace. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How do I add permanently to Pythons sys.path?
cnb wrote: no I can't... Python has supported packages since version 1.4 or so, so I'm pretty sure you can. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Why some blog entries at MSN Space support rss feed while others don't?
liuyuprc wrote: Not sure if this is the place this question should even be raised it isn't. -- http://mail.python.org/mailman/listinfo/python-list
Re: Stuck connection in Python 3.0b2 http.server
rs387 wrote: I've encountered a weird issue when migrating a web server to Python 3 - the browser would wait forever without showing a page, displaying Transferring data in the status bar. I tracked it down to a reference cycle in my BaseHTTPRequestHandler descendant - one of the attributes stored a dict of methods. Removing the cycle made the problem go away. In Python 2.5.2 the code works fine either way. Here's a minimal example which runs in both 2.5 and 3.0 - to see stuck connections run as-is in 3.0 and navigate to http://localhost:8123; to fix this comment out self.dummy = self (alternatively reset self.dummy = None at the end of the __init__ method). Am I doing it wrong, or is this a bug? it's weird enough to deserve an issue over at http://bugs.python.org/, at least. it'd probably be a good idea to test this on 2.6rc as well. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there any nice way to unpack a list of unknown size??
srinivasan srinivas wrote: I want to do something like below: 1. first, second, third, *rest = foo 2. for (a,b,c,*rest) in list_of_lists: update to Python 3.0 (as others have pointed out), or just do first, second, third = foo[:3] rest = foo[3:] for item in list_of_lists: a, b, c = item[:3] rest = item[3:] ... and move on to more interesting parts of your program. /F -- http://mail.python.org/mailman/listinfo/python-list
[issue3865] explain that profilers should be used for profiling, not benchmarking
Fredrik Lundh [EMAIL PROTECTED] added the comment: (the reason this is extra bad for C modules is that the profilers introduce overhead for Python code, but not for C-level functions. For example, using the standard profiler to benchmark parser performance for xml.etree.ElementTree vs. xml.etree.cElementTree will make ET appear to be about 10 times slower than it actually is.) ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3865 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue3865] explain that profilers should be used for profiling, not benchmarking
New submission from Fredrik Lundh [EMAIL PROTECTED]: You often see people using the profiler for benchmarking instead of profiling. I suggest adding a note that explains that the profiler modules are designed to provide an execution profile for a given program, not for benchmarking different libraries or, even worse, benchmarking Python code against C libraries. Point people to the timeit module if they want resonably accurate results. (and yes, it would be nice if the copyright text on the page http://docs.python.org/dev/library/profile.html was moved to the bottom of the page. If necessary, add something like This description of the profile module is Copyright © 1994, by InfoSeek Corporation, all rights reserved. Full copyright message below at the top.) -- assignee: georg.brandl components: Documentation messages: 73213 nosy: effbot, georg.brandl severity: normal status: open title: explain that profilers should be used for profiling, not benchmarking type: feature request versions: Python 2.6 ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3865 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: XML RPC Problem....
Usman Ajmal wrote: Please explain the arguments of send_request. What exactly are the connection, handler and request_body? It will be really helpful if you give an example of how do i call send_request you don't call send_request. you should pass the SecureTransport instance as an argument to the ServerProxy, which will then use it to talk to the server. see the custom transport example in the library reference that I pointed you to. http://www.python.org/doc/lib/xmlrpc-client-example.html /F -- http://mail.python.org/mailman/listinfo/python-list
Re: book example confusion
byron wrote: Being that each function is an object, a name assignment to (tmp1,tmp2) doesn't actually evaluate or run the function itself until the name is called.. the above would be true if the code had been tmp1, tmp2 = f1, f2 but it isn't. look again. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: XML RPC Problem....
Usman Ajmal wrote:
Where exactly should i call ServerProxy? Following is the code from my
client.py
ServerProxy is the preferred name. Server is an old alias for the same
class.
t = SecureTransport()
t.set_authorization(ustring, text_ucert)
server = xmlrpclib.Server('http://localhost:8000/',transport=t)
print server.s()
that code looks correct. so what's the problem?
/F
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Re: XML RPC Problem....
Usman Ajmal wrote: Problem is that when i start client (while the server is already running), i get an error i.e. Error 500 Internal Server Error that's a server error, not a client error. check the server logs (e.g. error.log or similar). /F -- http://mail.python.org/mailman/listinfo/python-list
Re: How to run PyOS_InputHook from python code (i.e. yield to event loops)
ville wrote: That's tk-specific, right? I'm looking for a snippet that - Would not be tied to tk upstream, you said: My actual use case is to keep a tkinter application responsive /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Checking the boolean value of a collection
Marco Bizzarri wrote: class FolderInUse: def true_for(self, archivefolder): return any([instance.forbid_to_close(archivefolder) for instance in self.core.active_outgoing_registration_instances()]) Is this any better? The true_for name does not satisfy me a lot... well, true_for is indeed pretty inscrutable, but I'm not sure that would be the first thing I'd complain about in that verbose mess... (when you pick method names, keep in mind that the reader will see the context, the instance, and the arguments at the same time as they see the name. there's no need to use complete sentences; pick short short descriptive names instead.) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: code style and readability [was: Re: Checking the boolean value of a collection]
Larry Bates wrote: I also have a personal dislike for early returns because I've found it makes it harder insert execution trace logging into the code. in a language that makes it trivial to wrap arbitrary callables in tracing wrappers? /F -- http://mail.python.org/mailman/listinfo/python-list
[issue3825] Major reworking of Python 2.5.2 re module
Fredrik Lundh [EMAIL PROTECTED] added the comment: A bit more information on the changes to the core engine that are responsible for the 2x speedup (on what?) would be nice to have, I think (especially since you seem to have removed the KMP prefix scanner). (Isn't there a RE benchmark suite somewhere under tests?) -- nosy: +effbot ___ Python tracker [EMAIL PROTECTED] http://bugs.python.org/issue3825 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
Re: Checking the boolean value of a collection
Marco Bizzarri wrote: Can you clarify where I can find any? It seems to me I'm unable to find it... it's a 2.5 addition. to use this in a future-compatible way in 2.3, you can add try: any except NameError: def any(iterable): for element in iterable: if element: return True return False to the top of the file (or to some suitable support library). 2.5 also provides an all function, which can be emulated as: try: all except NameError: def all(iterable): for element in iterable: if not element: return False return True /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Matching horizontal white space
[EMAIL PROTECTED] wrote: multipleSpaces = re.compile(u'\\h+') importantTextString = '\n \n \n \t\t ' importantTextString = multipleSpaces.sub(M, importantTextString) what's \\h supposed to mean? I would have expected consecutive spaces and tabs to be replaced by M but nothing is being replaced. if you know what you want to replace, be explicit: importantTextString = '\n \n \n \t\t ' re.compile([\t ]+).sub(M, importantTextString) '\nM\nM\nM' /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Checking the boolean value of a collection
Marco Bizzarri wrote: I would like to make this available to the whole project. I suspect I could put it in the package __init__.py... in that way, the __builtins__ namespace should have it... am I right? the __init__ module for package foo defines the contents of the foo module; it doesn't add anything to the builtin namespace. Diez made a typo in his post, btw. To add your own builtins, you should add them to the __builtin__ module (no plural s): import __builtin__ try: any except NameError: def any(iterable): for element in iterable: if element: return True return False __builtin__.any = any try: all except NameError: def all(iterable): for element in iterable: if not element: return False return True __builtin__.all = all The __builtins__ object is an implementation detail, and shouldn't be accessed directly. And I hope I don't need to point out that adding custom builtins nillywilly is a bad idea... /F -- http://mail.python.org/mailman/listinfo/python-list
Re: setattr in class
Bojan Mihelac wrote:
Hi all - when trying to set some dynamic attributes in class, for
example:
class A:
for lang in ['1', '2']:
exec('title_%s = lang' % lang) #this work but is ugly
# setattr(A, title_%s % lang, lang) # this wont work
setattr(A, title_1, x) # this work when outside class
print A.title_1
print A.title_2
I guess A class not yet exists in line 4. Is it possible to achive
adding dynamic attributes without using exec?
Move the for-in loop out of the class definition:
class A:
... pass
...
for lang in ['1', '2']:
... setattr(A, title_%s % lang, lang)
a = A()
a.title_1
'1'
A truly dynamic solution (using __getattr__ and modification on access)
would probably give you a more pythonic solution.
/F
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Re: Checking the boolean value of a collection
D'Arcy J.M. Cain wrote: Is there ever any advantage to having something as a builtin rather than as a regular user method? What difference does it make to the running script? I can see that adding bar from module foo to __builtins__ means that you can use bar() instead of foo.bar(). Is that the only benefit? basically, yes. in this case, it does make some sense to patch any/all into __builtin__, since they are builtins in a later version. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: lacking follow-through
Steve Holden wrote: The defence rests. can you please stop quoting that guy, so we don't have to killfile you as well... /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Which version
Don wrote: I'm a reasonably experienced in other languages and have just decided to get my feet wet with Python. But I'm using FC6 which has v2.4.4 installed, is this good enough to start out with or am I likely to encounter bugs that have been fixed in later versions. Python 2.4 is definitely good enough to start with. The bugs you'll find in released versions are usually pretty obscure; I've been using Python since release 1.1 or so, and I cannot remember ever having to upgrade due to a critical bug in the version I was using. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: Which version
Eric Wertman wrote: The subprocess module is one though footnote: subprocess works on older versions too, and can be trivially installed along with your application under Python 2.2 and 2.3. binary builds for Windows are available here: http://effbot.org/downloads/#subprocess /F -- http://mail.python.org/mailman/listinfo/python-list
Re: I want to use a C++ library from Python
Anders Eriksson wrote: I have looked (very briefly) at the three framework you mention but they all need the source code of the C++? No, they need header files and an import library to be able to compile the bindings and link them to your DLL. Do you know enough about C/C++ build issues to be able to compile a C++ program against the given library? If you do, fixing the rest should be straightforward, since the binding is just another C++ program designed to be imported by Python. /F -- http://mail.python.org/mailman/listinfo/python-list
