需要使用 lxml etree Python 将元素值替换为混合内容

Question

我有一个包含 xml 结构的字符串。 <root><test1>Test 1</test1><test2>Test <dummy>2</dummy> Test</test2><test3>Test 3</test3></root>，现在我想用混合内容 This is a New Input Scenario <AnyElement>Text</AnyElement> Check 替换元素 <test2> 中的值

下面是我的代码

from lxml import etree as ET

source = "<root><test1>Test 1</test1><test2>Test <dummy>2</dummy> Test</test2><test3>Test 3</test3></root>"
repl = "This is a New Input Scenario <AnyElement>Text</AnyElement> Check"

inp = ET.fromstring(source)

for inputelement in inp.xpath('.//test2'):
    inputelement.text = repl

inp = str(bytearray(ET.tostring(inp)).decode())
print(inp)

输出

<root><test1>Test 1</test1><test2>This is a New Input Scenario <AnyElement>Text</AnyElement> Check<dummy>2</dummy> Test</test2><test3>Test 3</test3></root>

预期输出

<root><test1>Test 1</test1><test2>This is a New Input Scenario <AnyElement>Text</AnyElement> Check</test2><test3>Test 3</test3></root>

Answer 1

这可以通过添加新元素及其text / tail 属性的组合来实现：

from lxml import etree as ET

source = "<root><test1>Test 1</test1><test2>Test <dummy>2</dummy> Test</test2><test3>Test 3</test3></root>"

# split mixed content into parts: text / element / text
repl1 = "This is a New Input Scenario "
repl2 = '<AnyElement>Text</AnyElement>'
repl3 = ' Check'

inp = ET.fromstring(source)

for inputelement in inp.xpath('.//test2'):
    # first attach text
    inputelement.text = repl1
    # create new element and attach final part to its tail
    anyelement = ET.XML(repl2)
    anyelement.tail = repl3
    # replace original dummy element with new one
    inputelement.replace(inputelement.find('dummy'), anyelement)
    

inp = str(bytearray(ET.tostring(inp)).decode())
print(inp)