8/5/2019 lxml · PyPI
https://pypi.org/project/lxml/ 1/5
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Projectdescription
lxmlisaPythonic,maturebindingforthelibxml2andlibxslt
libraries.Itprovidessafeandconvenientaccesstotheselibraries
usingtheElementTreeAPI.
ItextendstheElementTreeAPIsignificantlytooersupportfor
XPath,RelaxNG,XMLSchema,XSLT,C14Nandmuchmore.
Tocontacttheproject,gototheprojecthomepageorseeourbug
trackerathttps://launchpad.net/lxml
Incaseyouwanttousethecurrentin-developmentversionoflxml,
youcangetitfromthegithubrepositoryat
https://github.com/lxml/lxml.NotethatthisrequiresCythonto
buildthesources,seethebuildinstructionsontheprojecthome
page.Tothesameend,running easy_installlxml==dev will
installlxmlfrom
https://github.com/lxml/lxml/tarball/master#egg=lxml-devifyou
haveanappropriateversionofCythoninstalled.
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pipinstalllxml
lxml4.4.0
Latestversion
Lastreleased:Jul27,
2019
PowerfulandPythonicXMLprocessinglibrarycombininglibxml2/libxsltwiththe
ElementTreeAPI.
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8/5/2019 lxml · PyPI
https://pypi.org/project/lxml/ 2/5
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License:BSDLicense
(BSD)
Author:lxmldev
team
Maintainer:lxmldev
team
Maintainers
faassen
scoder
zope.winegg
builder
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DevelopmentStatus
5-
Production/Stable
IntendedAudience
Developers
Information
Technology
License
OSIApproved::BSD
License
Aeranoicialreleaseofanewstableseries,bugfixesmay
becomeavailableathttps://github.com/lxml/lxml/tree/lxml-4.4.
Running easy_installlxml==4.4bugfix willinstallthe
unreleasedbranchstatefrom
https://github.com/lxml/lxml/tarball/lxml-4.4#egg=lxml-4.4bugfix
assoonasamaintenancebranchhasbeenestablished.Notethat
thisrequiresCythontobeinstalledatanappropriateversionfor
thebuild.
4.4.0(2019-07-27)
Featuresadded
Element.clear() acceptsanewkeywordargument
keep_tail=True tocleareverythingbutthetailtext.Thisis
helpfulinsomedocument-styleusecases.
WhencreatingattributesornamespacesfromadictinPython
3.6+,lxmlnowpreservestheoriginalinsertionorderofthat
dict,insteadofalwayssortingtheitemsbyname.Asimilar
changewasmadeforElementTreeinCPython3.8.See
https://bugs.python.org/issue34160
Integerelementsin lxml.objectify implementthe
__index__() specialmethod.
GH#269:Read-onlyelementsinXSLTweremissingthe nsmap
property.OriginalpatchbyJanPazdziora.
ElementIncludecannowrestrictthemaximuminclusiondepth
viaa max_depth argumenttopreventcontentexplosion.Itis
limitedto6bydefault.
The target objectoftheXMLParsercanhave start_ns()
and end_ns() callbackmethodstolistentonamespace
declarations.
The TreeBuilder hasnewarguments comment_factory and
pi_factory topassfactoriesforcreatingcommentsand
processinginstructions,aswellasflagarguments
insert_comments and insert_pis todiscardthemfromthe
treewhensettofalse.
8/5/2019 lxml · PyPI
https://pypi.org/project/lxml/ 3/5
OperatingSystem
OSIndependent
Programming
Language
C
Cython
Python::2
Python::2.7
Python::3
Python::3.4
Python::3.5
Python::3.6
Python::3.7
Topic
Soware
Development::
Libraries::Python
Modules
TextProcessing::
Markup::HTML
TextProcessing::
Markup::XML
AC14N2.0implementationwasaddedas
etree.canonicalize() ,acorresponding
C14NWriterTarget class,anda c14n2 serialisationmethod.
Bugsfixed
WhenwritingtofilepathsthatcontaintheURLescape
character‘%’,thefilepathcouldwronglybemangledbyURL
unescapingandthuswritetoadierentfileordirectory.Code
thatwritestofilepathsthatareprovidedbyuntrustedsources,
butthatmustworkwithpreviousversionsoflxml,shouldbest
eitherrejectpathsthatcontain‘%’characters,orotherwise
makesurethatthepathdoesnotcontainmaliciouslyinjected
‘%XX’URLhexescapesforpathslike‘../’.
AssigningtoElementchildsliceswithnegativestepcould
insertthesliceatthewrongposition,startingtoofaronthe
le.
AssigningtoElementchildsliceswithoverlylargestepsize
couldtakeverylong,regardlessofthelengthoftheactualslice.
AssigningtoElementchildslicesofthewrongsizecould
sometimesfailtoraiseaValueError(likealistassignment
would)andinsteadassignoutsideoftheoriginalslicebounds
orleavepartsofitunreplaced.
The comment and pi eventsin iterwalk() werenever
triggered,andinstead,commentsandprocessinginstructions
inthetreewerereportedas start elements.Also,when
walkinganElementTree(asopposedtoitsrootelement),
commentsandPIsoutsideoftherootelementarenow
reported.
LP#1827833:TheRelaxNGcompactsyntaxsupportwasbroken
withrecentversionsof rnc2rng .
LP#1758553:TheHTMLelements source and track were
addedtothelistofemptytagsin lxml.html.defs .
Registeringaprefixotherthan“xml”fortheXMLnamespaceis
nowrejected.
FailingtowriteXSLToutputtoafilecouldraiseamisleading
exception.Itnowraises IOError .
8/5/2019 lxml · PyPI
https://pypi.org/project/lxml/ 4/5
Otherchanges
SupportforPython3.4wasremoved.
Whenusing Element.find*() withprefix-namespace
mappings,theemptystringisnowacceptedtodefineadefault
namespace,inadditiontothepreviouslysupported None
prefix.Emptystringsaremoreconvenientsincetheykeepall
prefixkeysinanamespacedictstrings,whichsimplifiessorting
etc.
The ElementTree.write_c14n() methodhasbeen
deprecatedinfavourofthelongpreferred
ElementTree.write(f,method="c14n") .Itwillberemoved
inafuturerelease.
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https://pypi.org/project/lxml/ 5/5
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