避免写< python中的XML字符 [英] Avoid writing < character to XML in python
问题描述
我正在尝试将此文本值写入XML标记
I am trying to write this text value to the XML tag like this
<Parameter name="name"><![CDATA[xyzvalue]]></Parameter>
无论何时,我都将此值设置为此标记的文本。它会这样生成
Whenever, i am setting this value as text to this tag. It generates it like this
<Parameter name="name"><![CDATA[xyzvalue]]></Parameter>
我需要避免代码中的转义字符
I need have tried to avoid unescape characters in the code
ET.SubElement(parameters, "Parameter", name="id").text = unescape("<![CDATA[xyzvalue]]>")
我如何避免将其像这样写入xml文件?我需要避免在XML中转义字符。
How can i avoid it writing like this to the xml file ? I need to avoid escaping characters in the XML.
这是我完整的代码:
map = ET.Element("Map")
parameters = ET.SubElement(map, "Parameters")
ET.SubElement(parameters, "Parameter", name="bounds").text = "-180,-85.05112877980659,180,85.05112877980659"
ET.SubElement(parameters, "Parameter", name="center").text = "0,0,2"
ET.SubElement(parameters, "Parameter", name="format").text = "png"
ET.SubElement(parameters, "Parameter", name="minzoom").text = "0"
ET.SubElement(parameters, "Parameter", name="maxzoom").text = "22"
ET.SubElement(parameters, "Parameter", name="scale").text = "1"
ET.SubElement(parameters, "Parameter", name="metatile").text = "2"
ET.SubElement(parameters, "Parameter", name="id").text = unescape("<![CDATA[xyzvalue]]>")
ET.SubElement(parameters, "Parameter", name="_updated").text = "1552288036000"
ET.SubElement(parameters, "Parameter", name="name").text = "<![CDATA[xyzvalue]]>"
ET.SubElement(parameters, "Parameter", name="tilejson").text = "<![CDATA[2.0.0]]>"
ET.SubElement(parameters, "Parameter", name="scheme").text = "<![CDATA[xyz]]>"
indent(map)
tree = ET.ElementTree(map)
tree.write("plotfinder_tiles.xml", xml_declaration=True, encoding='utf-8', method="xml")
这与如何使用ElementTree输出CDATA ,以某种方式,我遇到了这个问题
This is different to How to output CDATA using ElementTree, in a way, that i have this issue at the Element creation not to prettify/ remove after xml has been created.
推荐答案
如果是我,我会使用< a href = https://lxml.de/api/lxml.etree.CDATA-class.html rel = nofollow noreferrer> lxml的 CDATA
类。
If it were me, I'd use lxml's CDATA
class.
但是,如果您想坚持使用ElementTree,可以可以重新定义 ET._escape_cdata
,并确保文本不以<![CDATA [$code>且不以
]]>结尾
However, if you wanted to stick with ElementTree you could probably redefine ET._escape_cdata
and make sure the text doesn't start with <![CDATA[
and doesn't end with ]]>
before escaping.
示例...
Python 3。#
import xml.etree.ElementTree as ET
def escape_cdata(text):
# escape character data
try:
if not text.startswith("<![CDATA[") and not text.endswith("]]>"):
if "&" in text:
text = text.replace("&", "&")
if "<" in text:
text = text.replace("<", "<")
if ">" in text:
text = text.replace(">", ">")
return text
except (TypeError, AttributeError):
ET._raise_serialization_error(text)
ET._escape_cdata = escape_cdata
map_elem = ET.Element("Map")
parameters = ET.SubElement(map_elem, "Parameters")
ET.SubElement(parameters, "Parameter", name="bounds").text = "-180,-85.05112877980659,180,85.05112877980659"
ET.SubElement(parameters, "Parameter", name="center").text = "0,0,2"
ET.SubElement(parameters, "Parameter", name="format").text = "png"
ET.SubElement(parameters, "Parameter", name="minzoom").text = "0"
ET.SubElement(parameters, "Parameter", name="maxzoom").text = "22"
ET.SubElement(parameters, "Parameter", name="scale").text = "1"
ET.SubElement(parameters, "Parameter", name="metatile").text = "2"
ET.SubElement(parameters, "Parameter", name="id").text = "<![CDATA[xyzvalue]]>"
ET.SubElement(parameters, "Parameter", name="_updated").text = "1552288036000"
ET.SubElement(parameters, "Parameter", name="name").text = "<![CDATA[xyzvalue]]>"
ET.SubElement(parameters, "Parameter", name="tilejson").text = "<![CDATA[2.0.0]]>"
ET.SubElement(parameters, "Parameter", name="scheme").text = "<![CDATA[xyz]]>"
tree = ET.ElementTree(map_elem)
tree.write("test.xml", xml_declaration=True, encoding='utf-8', method="xml")
XML输出(test.xml;为了易于阅读而精美印刷)
XML Output (test.xml; pretty printed for readability)
<Map>
<Parameters>
<Parameter name="bounds">-180,-85.05112877980659,180,85.05112877980659</Parameter>
<Parameter name="center">0,0,2</Parameter>
<Parameter name="format">png</Parameter>
<Parameter name="minzoom">0</Parameter>
<Parameter name="maxzoom">22</Parameter>
<Parameter name="scale">1</Parameter>
<Parameter name="metatile">2</Parameter>
<Parameter name="id"><![CDATA[xyzvalue]]></Parameter>
<Parameter name="_updated">1552288036000</Parameter>
<Parameter name="name"><![CDATA[xyzvalue]]></Parameter>
<Parameter name="tilejson"><![CDATA[2.0.0]]></Parameter>
<Parameter name="scheme"><![CDATA[xyz]]></Parameter>
</Parameters>
</Map>
更新:Python 2.7的功能
def escape_cdata(text, encoding):
# escape character data
try:
if not text.startswith("<![CDATA[") and not text.endswith("]]>"):
if "&" in text:
text = text.replace("&", "&")
if "<" in text:
text = text.replace("<", "<")
if ">" in text:
text = text.replace(">", ">")
return text.encode(encoding, "xmlcharrefreplace")
except (TypeError, AttributeError):
ET._raise_serialization_error(text)
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