我希望通过分割xml文件中的值来修改这些值。你知道吗
我需要将se:SvgParameter[name="stroke-width"]
和se:Size
的值除以3.6。我在上找到了这个教程Python.org网站,Modifying an XML File,但它似乎不起作用,我在这里找不到类似的东西。任何帮助或点将不胜感激!你知道吗
下面是一些XML示例,但我希望能够将脚本输出到包含多个文件的文件夹中,并让它转换所有文件。你知道吗
XML格式:
<?xml version="1.0" encoding="ISO-8859-1"?>
<StyledLayerDescriptor version="1.1.0" xmlns="http://www.opengis.net/sld" xmlns:ogc="http://www.opengis.net/ogc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.opengis.net/sld http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd" xmlns:se="http://www.opengis.net/se">
<NamedLayer>
<se:Name>QGIS_SLD_ScaleProblem</se:Name>
<se:Description>
<se:Title>QGIS_SLD_ScaleProblem</se:Title>
<se:Abstract>This SLD is in Pixels, but QGIS will read it as mm</se:Abstract>
</se:Description>
<UserStyle>
<se:Name>QGIS_SLD_ScaleProblem</se:Name>
<se:FeatureTypeStyle>
<se:Rule>
<se:Name>QGIS_SLD_ScaleProblem_Line</se:Name>
<se:LineSymbolizer>
<se:Name>Line</se:Name>
<se:Stroke>
<se:SvgParameter name="stroke">#FF0000</se:SvgParameter>
<se:SvgParameter name="stroke-width">36</se:SvgParameter>
</se:Stroke>
</se:LineSymbolizer>
</se:Rule>
<se:Rule>
<se:Name>QGIS_SLD_ScaleProblem_Point</se:Name>
<se:PointSymbolizer>
<se:Name>Point</se:Name>
<se:Graphic>
<se:Mark>
<se:WellKnownName>circle</se:WellKnownName>
<se:Fill>
<se:SvgParameter name="fill">#FF0000</se:SvgParameter>
</se:Fill>
</se:Mark>
<se:Size>36</se:Size>
</se:Graphic>
</se:PointSymbolizer>
</se:Rule>
</se:FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>
代码:
import xml.etree.ElementTree as ET
from lxml import etree
tree = ET.parse('QGIS-SLD-ScaleProblem_Line.sld')
root = tree.getroot()
# To check that the script is reading the correct file
print("SLD file", root[0][0].text, "loaded.")
# Registers namespaces to prevent them being filled with defaults
ET.register_namespace('', "http://www.opengis.net/sld")
ET.register_namespace('ogc', "http://www.opengis.net/ogc")
ET.register_namespace('xsi', "http://www.w3.org/2001/XMLSchema-instance")
ET.register_namespace('xlink', "http://www.w3.org/1999/xlink")
ET.register_namespace('schemaLocation', "http://www.opengis.net/sld http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd")
ET.register_namespace('se', "http://www.opengis.net/se")
# This section "should" search the XML for se:SvgParameter name="stroke-width" and se:Size and divide the value by 3.6
for SvgParameter in root.iter('SvgParameter'):
new_SvgParameter = int(SvgParameter.text) / 3.6
SvgParameter.text = str(new_SvgParameter)
for Size in root.iter('Size'):
new_Size= int(Size.text) / 3.6
Size.text = str(new_Size)
tree.write("GIS-SLD-ScaleFixed.sld", xml_declaration=True, encoding='ISO-8859-1')
我看过的答案:
考虑一下XSLT这是一种专门用于转换XML文件的语言。Python的
lxml
模块可以运行xslt1.0脚本。另外,XSLT可以在Python之外运行,因此具有可移植性。你知道吗只需调用identity transform即可按原样复制整个文档,然后在选定的节点上运行分割。这种方法不需要
for
循环或if
逻辑。你知道吗XSLT(另存为.xsl文件,一种特殊的格式良好的XML文件)
Python(针对多个文件在循环中迭代以下进程)
输出
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