Question

我有一个带有一些错误名称空间的输入XML。我试图用ElementTree修复它们，但没有成功

示例输入：（此处ns0：可以是ns：，p：，n：等...）

<ns0:Invoice xmlns:ns0="http://invoices.com/docs/xsd/invoices/v1.2" version="FPR12">

  <InvoiceHeader>
    <DataH>data header</DataH>
  </InvoiceHeader>

  <InvoiceBody>
    <DataB>data body</DataB>
  </InvoiceBody>

</ns0:Invoice>

需要的输出文件：（根目录中的命名空间必须没有前缀，并且某些内部标记声明为xmlns =“”）

<Invoice xmlns:"http://invoices.com/docs/xsd/invoices/v1.2" version="FPR12">

  <InvoiceHeader xmlns="">
    <DataH>data header</DataH>
  </InvoiceHeader>

  <InvoiceBody xmlns="">
    <DataB>data body</DataB>
  </InvoiceBody>

</Invoice>

我尝试如下更改根名称空间，但生成的文件未更改

import xml.etree.ElementTree as ET

tree = ET.parse('./cache/test.xml')
root = tree.getroot()

root.tag = '{http://invoices.com/docs/xsd/invoices/v1.2}Invoice'
xml = ET.tostring(root, encoding="unicode")
with open('./cache/output.xml', 'wt') as f:
    f.write(xml)

代替尝试

changing root.tag  = 'Invoice'

它产生一个根本没有名称空间的标签

请让我知道我是否在犯任何错误，还是应该切换到另一个库，或者尝试使用正则表达式替换字符串

预先感谢

Answer 1

现在是否对任何人都有用，但我设法使用lxml和以下代码修复了名称空间。

from lxml import etree
from copy import deepcopy

tree = etree.parse('./cache/test.xml')

# create a new root without prefix in the namespace
NSMAP = {None : "http://invoices.com/docs/xsd/invoices/v1.2"}
root = etree.Element("{http://invoices.com/docs/xsd/invoices/v1.2}Invoice", nsmap = NSMAP)

# copy attributes from original root
for attr, value in tree.getroot().items():
    root.set(attr,value)

# deep copy of children (adding empty namespace in some tags)
for child in tree.getroot().getchildren():
    if child.tag in( 'InvoiceHeader', 'InvoiceBody'):
        child.set("xmlns","")
    root.append( deepcopy(child) )

xml = etree.tostring(root, pretty_print=True)
with open('./cache/output.xml', 'wb') as f:
    f.write(xml)

使用ElementTree在Python 3中处理XML命名空间

1 个答案: