Python 如何在包含'；的KML树中查找元素：'；

问题：找不到带有“：”的元素-无法运行程序。我找到了一些关于的参考资料，但我不知道如何应用它们

代码：

示例数据文件：

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<gx:Track>
<when>2012-03-10T05:52:38.564-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
<when>2012-03-10T06:00:39.748-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
</gx:Track>
</kml>

2012-03-10T05:52:38.564-08:00
16.424247 48.236804 0
2012-03-10T06:00:39.748-08:00
16.424247 48.236804 0

错误：

Traceback (most recent call last):
  File "main.py", line 7, in <module>
    track = kmlTree.find(".//{http://www.opengis.net/kml/2.2}gx:Track")        #most interesting data is stored in this tag
  File "/usr/lib/python2.6/xml/etree/ElementTree.py", line 614, in find
    return self._root.find(path)
  File "/usr/lib/python2.6/xml/etree/ElementTree.py", line 330, in find
    return ElementPath.find(self, path)
  File "/usr/lib/python2.6/xml/etree/ElementPath.py", line 186, in find
    return _compile(path).find(element)
  File "/usr/lib/python2.6/xml/etree/ElementPath.py", line 176, in _compile
    p = Path(path)
  File "/usr/lib/python2.6/xml/etree/ElementPath.py", line 93, in __init__
    "expected path separator (%s)" % (op or tag)
SyntaxError: expected path separator (:)

回溯（最近一次呼叫最后一次）：
文件“main.py”，第7行，在
track=kmlTree.find（“）//{http://www.opengis.net/kml/2.2}gx:Track”）#最有趣的数据存储在此标记中
文件“/usr/lib/python2.6/xml/etree/ElementTree.py”，第614行，在find中
返回self.\u root.find（路径）
文件“/usr/lib/python2.6/xml/etree/ElementTree.py”，第330行，在find中
return ElementPath.find（self，path）
文件“/usr/lib/python2.6/xml/etree/ElementPath.py”，第186行，在find中
return _compile（path）.find（element）
文件“/usr/lib/python2.6/xml/etree/ElementPath.py”，第176行，在编译中
p=路径（路径）
文件“/usr/lib/python2.6/xml/etree/ElementPath.py”，第93行，在__
“预期的路径分隔符（%s）”%（操作或标记）
SyntaxError:应为路径分隔符（：）

---

代码正在为没有“：”的元素工作。

我知道这是一个使用的替代解决方案

>tree=etree.parse（'test.xml'））
>>>xpath（“.//gx:Track”，名称空间={'gx'：'http://www.google.com/kml/ext/2.2'})
[]
>>>xpath（“//gx:Track/*/text（）”，名称空间={'gx'：'http://www.google.com/kml/ext/2.2'})
['2012-03-10T05:52:38.564-08:00'，'16.424247 48.236804 0'，'2012-03-10T06:00:39.748-08:00'，'16.424247 48.236804 0']

---

我相信类似的方法也可以用于

ElementTree

gx

是

{http://www.google.com/kml/ext/2.2}

。从

查找
中取出
gx:
，并使用正确的命名空间：

from xml.etree import ElementTree as et

data = '''\
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<gx:Track>
<when>2012-03-10T05:52:38.564-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
<when>2012-03-10T06:00:39.748-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
</gx:Track>
</kml>
'''

kmlTree = et.fromstring(data)

track = kmlTree.find(".//{http://www.google.com/kml/ext/2.2}Track")
print(track)

从xml.etree导入ElementTree作为et
数据=“”\
2012-03-10T05:52:38.564-08:00
16.424247 48.236804 0
2012-03-10T06:00:39.748-08:00
16.424247 48.236804 0
'''
kmlTree=et.fromstring（数据）
track=kmlTree.find（“）//{http://www.google.com/kml/ext/2.2}轨道“）
打印（轨道）

输出


>>> tree = etree.parse('test.xml')
>>> tree.xpath(".//gx:Track",namespaces={'gx':'http://www.google.com/kml/ext/2.2'})
[<Element {http://www.google.com/kml/ext/2.2}Track at 0x1c1e3f0>]


>>> tree.xpath("//gx:Track/*/text()",namespaces={'gx':'http://www.google.com/kml/ext/2.2'})
['2012-03-10T05:52:38.564-08:00', '16.424247 48.236804 0', '2012-03-10T06:00:39.748-08:00', '16.424247 48.236804 0']

from xml.etree import ElementTree as et

data = '''\
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<gx:Track>
<when>2012-03-10T05:52:38.564-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
<when>2012-03-10T06:00:39.748-08:00</when>
<gx:coord>16.424247 48.236804 0</gx:coord>
</gx:Track>
</kml>
'''

kmlTree = et.fromstring(data)

track = kmlTree.find(".//{http://www.google.com/kml/ext/2.2}Track")
print(track)

<Element '{http://www.google.com/kml/ext/2.2}Track' at 0x40cca70>