使用elementtree处理后删除XML标头 [英] XML header getting removed after processing with elementtree

问题描述

我有一个xml文件，我使用Elementtree在xml文件中添加了一个新标签。处理之前，我的xml文件如下所示

i have an xml file and i used Elementtree to add a new tag to the xml file.My xml file before processing is as follows

<?xml version="1.0" encoding="utf-8"?>

<PackageInfo xmlns="http://someurlpackage">


<data ID="http://someurldata1">data1</data >
<data ID="http://someurldata2">data2</data >
<data ID="http://someurldata3">data3</data >
</PackageInfo>

我使用以下python代码添加了新的数据标签并将其写入xml文件

I used following python code to add a new data tag and write it to my xml file

 tree = ET.ElementTree(xmlFile)
 root = tree.getroot()
 elem= ET.Element('data')
 elem.attrib['ID']="http://someurldata4"
 elem.text='data4'
 root[1].append(elem)
 tree = ET.ElementTree(root)
 tree.write(xmlFile)

但是生成的xml文件具有<？xml version = 1.0 encoding = utf-8？> 缺少，文件看起来如下所示

But the resultant xml file have <?xml version="1.0" encoding="utf-8"?> absent and the file looks as below

<PackageInfo xmlns="http://someurlpackage">
<data ID="http://someurldata1">data1</data >
<data ID="http://someurldata2">data2</data >
<data ID="http://someurldata3">data3</data >
</PackageInfo>

有什么方法可以包含xml标头，而不是对行进行硬编码

Is there any way to include the xml header rather than hardcoding the line

推荐答案

您似乎需要 write 方法的可选参数即可输出声明。

It looks like you need optional arguments to the write method to output the declaration.

http://docs.python.org/library/xml.etree.elementtree.html#elementtree-elementtree-objects

tree.write(xmlfile,xml_declaration=True)

---

恐怕我对 xml.etree.ElementTree 不太熟悉，它是python版本之间的差异。

---

I'm afraid I'm not that familiar with xml.etree.ElementTree and it's variation between python releases.

在这里与 lxml.etree 一起使用：

>>> from lxml import etree
>>> sample = """<?xml version="1.0" encoding="utf-8"?>
... <PackageInfo xmlns="http://someurlpackage">
... <data ID="http://someurldata1">data1</data >
... <data ID="http://someurldata2">data2</data >
... <data ID="http://someurldata3">data3</data >
... </PackageInfo>"""
>>>
>>> doc = etree.XML(sample)
>>> data = doc.makeelement("data")
>>> data.attrib['ID'] = 'http://someurldata4'
>>> data.text = 'data4'
>>> doc.append(data)
>>> etree.tostring(doc,xml_declaration=True)
'<?xml version=\'1.0\' encoding=\'ASCII\'?>\n<PackageInfo xmlns="http://someurlpackage">\n<data ID="http://someurldata1">data1</data>\n<data ID="http://someurldata2">data2</data>\n<data ID="http://someurldata3">data3</data>\n<data ID="http://someurldata4">data4</data></PackageInfo>'
>>> etree.tostring(doc,xml_declaration=True,encoding='utf-8')
'<?xml version=\'1.0\' encoding=\'utf-8\'?>\n<PackageInfo xmlns="http://someurlpackage">\n<data ID="http://someurldata1">data1</data>\n<data ID="http://someurldata2">data2</data>\n<data ID="http://someurldata3">data3</data>\n<data ID="http://someurldata4">data4</data></PackageInfo>'

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