如何通过python 3.6.5中的变量创建子元素 [英] how to create a sub-element through variable in python 3.6.5
问题描述
我的代码是:
import xml.etree.ElementTree as ET
from lxml import etree
var1 = '<name>This is my text</name>'
page = etree.Element('first')
doc = etree.ElementTree(page)
second = etree.SubElement(page, 'second')
second.text = var1
doc.write('a.xml', xml_declaration=True, encoding='utf-8')
我的输出是:
<?xml version='1.0' encoding='UTF-8'?>
<first><second><name>This is my text</name></second></first>
我想要的输出是:
<?xml version='1.0' encoding='UTF-8'?>
<first><second><name>This is my text</name></second></first>
实际上，我想通过变量创建子元素，但我不知道我们的变量中有多少个可用元素.这仅出于测试目的，因此请注意这一点.
Actually, I want to create sub-element through variable and I don't know how many elements are available in our variable. this is only for test purpose so please take care of this.
推荐答案
无法通过将子元素作为XML标记字符串提供来创建子元素.就像<second>一样，必须使用SubElement创建<name>元素.
It is not possible to create a subelement by supplying it as a string of XML markup. The <name> element has to be created using SubElement, just like <second>.
以下代码产生所需的输出:
The following code produces the desired output:
from lxml import etree
page = etree.Element('first')
second = etree.SubElement(page, 'second')
name = etree.SubElement(second, 'name')
name.text = "This is my text"
doc = etree.ElementTree(page)
doc.write('a.xml', xml_declaration=True, encoding='utf-8')
另一种方法是将<name>This is my text</name>字符串解析为Element对象，并将其附加到父对象:
An alternative is to parse the <name>This is my text</name> string into an Element object and append it to the parent:
from lxml import etree
var1 = '<name>This is my text</name>'
name = etree.fromstring(var1)
page = etree.Element('first')
second = etree.SubElement(page, 'second')
second.append(name)
doc = etree.ElementTree(page)
doc.write('b.xml', xml_declaration=True, encoding='utf-8')
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