Bry*_*yce 20 python xml openstreetmap
我有一组超级简单的XML文件来解析......但是......他们使用自定义的实体.我不需要将这些映射到字符,但我确实希望对每个字符进行解析和操作.例如:
<Style name="admin-5678">
<Rule>
<Filter>[admin_level]='5'</Filter>
&maxscale_zoom11;
</Rule>
</Style>
http://effbot.org/elementtree/elementtree-xmlparser.htm上有一个诱人的暗示,XMLParser对实体的支持有限,但我找不到提到的方法,一切都会出错:
#!/usr/bin/python
##
## Where's the entity support as documented at:
## http://effbot.org/elementtree/elementtree-xmlparser.htm
## In Python 2.7.1+ ?
##
from pprint import pprint
from xml.etree import ElementTree
from cStringIO import StringIO
parser = ElementTree.ElementTree()
#parser.entity["maxscale_zoom11"] = unichr(160)
testf = StringIO('<foo>&maxscale_zoom11;</foo>')
tree = parser.parse(testf)
#tree = parser.parse(testf,"XMLParser")
for node in tree.iter('foo'):
print node.text
这取决于您如何调整评论:
xml.etree.ElementTree.ParseError: undefined entity: line 1, column 5
要么
AttributeError: 'ElementTree' object has no attribute 'entity'
要么
AttributeError: 'str' object has no attribute 'feed'
对于那些好奇的人来说,XML来自OpenStreetMap的mapnik项目.
cne*_*son 13
我不确定这是否是ElementTree中的错误或者是什么,但是你需要在expat解析器上调用UseForeignDTD(True)来表现它过去的行为.
这有点hacky,但你可以通过创建自己的ElementTree.Parser实例,在它的xml.parsers.expat实例上调用方法,然后将其传递给ElementTree.parse()来实现:
from xml.etree import ElementTree
from cStringIO import StringIO
testf = StringIO('<foo>&moo_1;</foo>')
parser = ElementTree.XMLParser()
parser.parser.UseForeignDTD(True)
parser.entity['moo_1'] = 'MOOOOO'
etree = ElementTree.ElementTree()
tree = etree.parse(testf, parser=parser)
for node in tree.iter('foo'):
print node.text
这输出"MOOOOO"
或者使用映射界面:
from xml.etree import ElementTree
from cStringIO import StringIO
class AllEntities:
def __getitem__(self, key):
#key is your entity, you can do whatever you want with it here
return key
testf = StringIO('<foo>&moo_1;</foo>')
parser = ElementTree.XMLParser()
parser.parser.UseForeignDTD(True)
parser.entity = AllEntities()
etree = ElementTree.ElementTree()
tree = etree.parse(testf, parser=parser)
for node in tree.iter('foo'):
print node.text
输出"moo_1"
更复杂的修复方法是继承ElementTree.XMLParser并在那里修复它.
Ray*_*Luo 11
正如@cnelson已经在评论中指出的那样,这里选择的解决方案在Python 3中不起作用.
我终于搞定了.引用此问答.
受这篇文章的启发,我们可以将一些XML定义添加到传入的原始HTML内容中,然后ElementTree可以开箱即用.
这适用于Python 2.6,2.7,3.3,3.4.
import xml.etree.ElementTree as ET
html = '''<html>
<div>Some reasonably well-formed HTML content.</div>
<form action="login">
<input name="foo" value="bar"/>
<input name="username"/><input name="password"/>
<div>It is not unusual to see in an HTML page.</div>
</form></html>'''
magic = '''<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" [
<!ENTITY nbsp ' '>
]>''' # You can define more entities here, if needed
et = ET.fromstring(magic + html)
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