避免写<字符在Python XML(Avoid writing < character

我想写这个文本值这样的XML标签

 <Parameter name="name"><![CDATA[xyzvalue]]></Parameter>

无论何时，我将该值设置为文本到这个标签。它产生像这样

<Parameter name="name">&lt;![CDATA[xyzvalue]]&gt;</Parameter>

我需要试图避免在代码UNESCAPE字符

ET.SubElement(parameters, "Parameter", name="id").text = unescape("&lt;![CDATA[xyzvalue]]>")

我怎样才能避免它写这样的XML文件？我需要避免在XML转义字符。

这是我的完整代码：

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("&lt;![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")

这是不同的如何使用输出CDATA ElementTree的，在某种程度上，我有在元素创建这个问题不是美化/ XML创建后删除。

如果是我，我会使用LXML的CDATA类。

但是，如果你想坚持ElementTree的你很可能重新定义ET._escape_cdata并确保文本不是以<![CDATA[与没有结束]]>就逃。

例...

Python的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("&", "&amp;")
            if "<" in text:
                text = text.replace("<", "&lt;")
            if ">" in text:
                text = text.replace(">", "&gt;")
        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 （的test.xml;漂亮的印刷为可读性）

<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：功能为Python 2.7

def escape_cdata(text, encoding):
    # escape character data
    try:
        if not text.startswith("<![CDATA[") and not text.endswith("]]>"):
            if "&" in text:
                text = text.replace("&", "&amp;")
            if "<" in text:
                text = text.replace("<", "&lt;")
            if ">" in text:
                text = text.replace(">", "&gt;")
        return text.encode(encoding, "xmlcharrefreplace")
    except (TypeError, AttributeError):
        ET._raise_serialization_error(text)