Question

我的研究发现使用XPath和/或xml ElementTree应该可以工作，但是使用以下代码（我知道它需要一些工作 - 对python来说是新的），我无法得到我正在寻找的结果。

我正在寻找将我的kml中超过单个字符的任何名称标签替换为空白字符串。我想保留元素树的结构，因为有重要的文件夹和子文件夹，因此逐行的字符串.replace方法可能无法工作，因为未知的缩进。

任何帮助将不胜感激，这是我迄今为止所拥有的。

import sys, string, os, lxml
import xml.etree.ElementTree as ET

kml_file = open(r'C:\temp\doc.kml', 'r')

tree = ET.parse(kml_file)
root = tree.getroot()
for name in root.findall('.//{http://www.opengis.net/kml/2.2}name'):
    if len(name.text) > 1:
        name.text = ""

kml_file.close()

示例KML代码：

<?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">
<Document>
    <name>TempFile.kmz</name>
    <open>1</open>
    <StyleMap id="msn_ylw-pushpin">
        <Pair>
            <key>normal</key>
            <styleUrl>#sn_ylw-pushpin3</styleUrl>
        </Pair>
        <Pair>
            <key>highlight</key>
            <styleUrl>#sh_ylw-pushpin0</styleUrl>
        </Pair>
    </StyleMap>
    <Style id="sn_ylw-pushpin3">
        <IconStyle>
            <scale>1.1</scale>
            <Icon>
                <href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
            </Icon>
            <hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
        </IconStyle>
    </Style>
    <Style id="sh_ylw-pushpin0">
        <IconStyle>
            <scale>1.3</scale>
            <Icon>
                <href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
            </Icon>
            <hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
        </IconStyle>
    </Style>
    <Folder>
        <name>My Places</name>
        <open>1</open>
        <Style>
            <ListStyle>
                <listItemType>check</listItemType>
                <ItemIcon>
                    <state>open</state>
                    <href>C:/Documents and Settings/sfmeyer/Local Settings/Temp/wz5b57/files/mysavedplaces_open.png</href>
                </ItemIcon>
                <ItemIcon>
                    <state>closed</state>
                    <href>C:/Documents and Settings/sfmeyer/Local Settings/Temp/wz5b57/files/mysavedplaces_closed.png</href>
                </ItemIcon>
                <bgColor>00ffffff</bgColor>
                <maxSnippetLines>2</maxSnippetLines>
            </ListStyle>
        </Style>
        <Placemark>
            <name>NameRemove0</name>
            <LookAt>
                <longitude>-111.6385075333604</longitude>
                <latitude>33.89355748553</latitude>
                <altitude>0</altitude>
                <heading>-0.003511129776839782</heading>
                <tilt>18.73370091942461</tilt>
                <range>363.2207262112541</range>
                <gx:altitudeMode>relativeToSeaFloor</gx:altitudeMode>
            </LookAt>
            <styleUrl>#msn_ylw-pushpin</styleUrl>
            <Point>
                <gx:altitudeMode>clampToSeaFloor</gx:altitudeMode>
                <coordinates>-111.6380073829088,33.89304257965345,0</coordinates>
            </Point>
        </Placemark>
    </Folder>
</Document>
</kml>

错误：

File "C:\Program Files\Python26\ArcGIS10.0\lib\xml\etree\ElementTree.py", line 862, in parse
    tree.parse(source, parser)
  File "C:\Program Files\Python26\ArcGIS10.0\lib\xml\etree\ElementTree.py", line 587, in parse
    self._root = parser.close()
  File "C:\Program Files\Python26\ArcGIS10.0\lib\xml\etree\ElementTree.py", line 1254, in close
    self._parser.Parse("", 1) # end of data
ExpatError: unclosed CDATA section: line 286, column 77

Answer 1

如果没有看到您的KML文件，我无法确定这是您的问题，但很可能“名称”可能不会出现在您的KML名称空间之外。请查看此question以获取更多详细信息以及如何在lxml中执行此操作。

在常规的ElementTree语法中，如果doc.kml的内容是 -

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2">
  <Document>
    <name>KML Samples</name>
  </Document>
</kml>

你可以使用：

import xml.etree.ElementTree as ET

kml_file = open(r'C:\temp\doc.kml, 'r')

tree = ET.parse(kml_file)
root = tree.getroot()
for name in root.findall('.//{http://www.opengis.net/kml/2.2}name'):
    if len(name.text) > 1:
        name.text = ""

kml_file.close()

Answer 2

从原始脚本中，我添加了一个带有输出名称的变量，以及一个在最后写入新文件的函数。我原来帖子的“错误：”部分是由于KML文档中的格式无效，@ pauldom指出这是因为我只分享了整个文档的作用。

import sys, string, os, lxml
import xml.etree.ElementTree as ET

kml_file = open(r'C:\temp\doc.kml', 'r+')
kml_file2 = (r'C:\temp\doc2.kml')

tree = ET.parse(kml_file)
root = tree.getroot()
for name in root.findall('.//{http://www.opengis.net/kml/2.2}name'):
    if len(name.text) > 1:
        name.text = "n/a"
        tree.write(kml_file2)                
kml_file.close()

使用Python26删除KML'name'标签

2 个答案: