Mailman 3 November 2009 - lxml - The Python XML Toolkit

[lxml-dev] ancestor-or-self
by Polat Tuzla 09 Nov '09

09 Nov '09

Hi, I'm observing that xpath axis "ancestor-or-self" does not function properly. Below outputs demonstrate the case. In the first one whole tree is printed, and in the second one ancestor-or-self is used, but the result does not differ. I'll open a ticket for this as a bug, unless someone tells me that I'm missing a point. Thanks, Polat Tuzla In [309]: print etree.tostring(root, pretty_print=True) <a> <b> <c/> <x> <z/> </x> </b> </a> In [310]: print etree.tostring(root.xpath("/a/b/c/ancestor-or-self::*")[0], pretty_print=True) .....: <a> <b> <c/> <x> <z/> </x> </b> </a>

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[lxml-dev] Bug? lxml.html produces bogus results if HTML contains control characters
by Joseph Barillari 09 Nov '09

09 Nov '09

Hi, I'm a big fan of lxml.html, but I think I've just found a bug in it: Here's a test case. html = """ <html><body> <table> <tr> <td>one</td> <td>\x05two</td> <td>three</td> </tr> </table> </body></html> """ import lxml.html tree = lxml.html.fromstring(html) xpath = "/descendant::table" cells = tree.xpath(xpath)[0].getchildren()[0].getchildren() print [cell.text_content() for cell in cells] # prints ['one', ''] tree = lxml.html.fromstring(html.replace("\x05","")) cells = tree.xpath(xpath)[0].getchildren()[0].getchildren() print [cell.text_content() for cell in cells] # prints ['one', 'two', 'three'] The apparent bug is that lxml.html fails to parse the above HTML properly when it contains a control character (\x05 a.k.a ^E). Obviously, well-formed HTML will not contain such characters, but real-world HTML often does. The library does not report an error, but simply truncates the row at the control character, which made this behavior tricky for me track down. I'm running the following versions: lxml.etree: (2, 2, 2, 0) libxml used: (2, 7, 6) libxml compiled: (2, 7, 5) libxslt used: (1, 1, 24) libxslt compiled: (1, 1, 26) I must admit that I do not know if this is a bug in lxml or in libxml, but I am certainly willing to help investigate. Best, Joe

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[lxml-dev] Fun with unicode errors
by Praktikant3 - SAG 07 Nov '09

07 Nov '09

Hi, Maybe you have an idea what could be happening here, otherwise I will (try to) come back with a more complete example. For now I have this small code excerpt that behaves strangely: (isinstance(output_xml, lxml.etree._Element) is True) # The two ET.tostring() invocations below, (1) and (2), show the # following behaviour: # (1) "works" (UnicodeDecodeError about el.text after (2)) # (1) (2) "works" (UnicodeDecodeError about el.text after (2)) # (2) does not work, lxml.etree.SerialisationError: IO_ENCODER about ET.tostsring() (2) ET.tostring(output_xml) # (1) # Make pretty-printing work by removing unnecessary whitespace: for el in output_xml.iter(): ET.tostring(el) # (2) if len(el) and el.text and not el.text.strip(): el.text = None if el.tail and not el.tail.strip(): el.tail = None (1) and (2) are commented out to run them in the different combinations discussed. If you have a hint about what might be the issue there, I'd be very glad to hear it. I'm using this code on WinXP SP3, Python 2.6.4, lxml 2.2.2 (pre-compiled package). Expected behaviour would be to run without raising any exception in any of the runs. Something about output_xml changed, as this code snipped used to work. Thanks, Felix

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[lxml-dev] No module named lxml
by Kevin Ar18 07 Nov '09

07 Nov '09

I'm not really sure how to setup lxml properly, so I need some help. Summary: import lxml gives the following error: ImportError: No module named lxml Background: I first tried out the install instructions here: http://codespeak.net/lxml/installation.html#ms-windows This involved 3 steps: 1) using easy_install lxml 2) Installing libxml 3) Installing libxslt Suffice to say that method never worked right. During all those steps, I probably did something wrong. Next, I tried the Windows binary egg method (after I deleted the previous lxml install). I downloaded: lxml-2.2.2-py2.6-win-amd64.egg and I copied the file to: Python2.6.1\Lib\site-packages\lxml-2.2.2-py2.6-win-amd64.egg Questions: * Is this the correct way to install an egg? (or is there more to it?) * Could, elementree or html5lib packages be causing a conflict? * So, what am I doing wrong? :) Is it something simple that I missed or should it be working the way I have it now? System info: Windows Vista 64bit Python 2.6.4 64bit Contents of my site-packages: babel-0.9.4-py2.6.egg cherrypy-3.1.1-py2.6.egg decorator-3.0.0-py2.6.egg django-1.0.2_final-py2.6.egg django_wikiapp-0.2.0-py2.6.egg 939 easy-install.pth elementtree-1.2.7_20070827_preview-py2.6.egg elixir-0.3.0-py2.6.egg elixir-0.6.1-py2.6.egg FormEncode-1.2.3dev_r0-py2.6.egg Genshi-0.5.1-py2.6.egg Genshi.egg-info html5lib-0.11.1-py2.6 - Copy.zip html5lib-0.11.1-py2.6.egg lxml-2.2.2-py2.6-win-amd64.egg mako-0.2.4-py2.6.egg nose-0.10.4-py2.6.egg paste-1.7.2-py2.6.egg pastedeploy-1.3.3-py2.6.egg pastescript-1.7.3-py2.6.egg posterity-0.6-py2.6.egg Pylons-0.9.7-py2.6.egg pysqlite-2.5.5-py2.6.egg-info pysqlite2 pytidylib-0.1.2-py2.6.egg-info README.txt resolver-0.2.1-py2.6.egg selector-0.8.11-py2.6.egg setuptools-0.6c9-py2.6.egg setuptools.pth sqlalchemy-0.3.11-py2.6.egg sqlalchemy-0.5.3-py2.6.egg tempita-0.2-py2.6.egg tidy tidylib uTidylib-0.2-py2.6.egg-info weberror-0.10.1-py2.6.egg webob-0.9.6.1-py2.6.egg webtest-1.1-py2.6.egg wsgiref-0.1.2-py2.6.egg xlrd xlrd-0.6.1-py2.6.egg-info zzzzzzhtml5lib-0.11.1-py2.6 - Copyzzzzzzzzzzz _________________________________________________________________ Bing brings you maps, menus, and reviews organized in one place. http://www.bing.com/search?q=restaurants&form=MFESRP&publ=WLHMTAG&crea=TEXT…

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[lxml-dev] 2.2.2 binary egg for Mac OS X 10.6
by Martin Aspeli 02 Nov '09

02 Nov '09

Hi, We have binary eggs for Python 2.4, 2.5 and 2.6 on Mac OS X 10.5. Unfortunately, we don't have them for 10.6 (Snow Leopard), and the 10.5 egg doesn't work on 10.6 (it crashes on startup). Is there any chance we could have 10.6 eggs? If there are reliable build instructions, I can help build them. Cheers, Martin

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Re: [lxml-dev] lxml 2.2.3 released
by Nicholas Dudfield 02 Nov '09

02 Nov '09

Stefan & Co, Great news on 2.2.3. Any ETA for windows 2.5 binaries? Cheers.

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[lxml-dev] About encoding question !
by David Shieh 02 Nov '09

02 Nov '09

Hey guys, I recently use lxml to do my HTML parsing, it's really great, and indeed the fastest one compare to other libraries. But since I begin to parse some other pages using gb2312 coding, I've a problem. The output is in here: http://david-paste.cn/paste/50/ Please help me with this, thanks you guys. Regards, David -- ---------------------------------------------- Attitude determines everything ! ----------------------------------------------

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