python合并从文件1到文件2的某些XML标签 [英] python to merge certain XML tags from file1 to file 2

问题描述

我有两个xml。 XML1和XML2。我想用XML2的内容更新XMl1。

I have two xmls. XML1 and XML2. i would like to update XMl1 with the content of XML2.

<vdu xmlns="test:file">
<lsm>
    <m-id>v1</m-id>
    <name>v1</name>
    <communication>bi</communication>
    <states>
        <s-name>stage1</s-name>
        <state>
            <s-type>defaultState</s-type>
            <s-func>
                <p-name>pkgname</p-name>
                <f-list>
                    <f-name>funcNAME</f-name>
                    <f-arg>{&amp;}</f-arg>
                </f-list>
            </s-func>
        </state>
        <lib-path>libpath</lib-path>
        <e-list>
            <e-name>noEvent</e-name>
            <event>
                <nss>INC</nss>
                <nfs>INC</nfs>
                <actions>
                    <p-name>pkgName</p-name>
                    <f-list>
                        <f-name>toF</f-name>
                        <f-arg></f-arg>
                    </f-list>
                </actions>
            </event>
        </e-list>

XML2

XML2

<vdu xmlns="test:file">
<lsm>
    <m-id>v1</m-id>
    <name>v1</name>
    <communication>bi</communication>
        <e-list>
            <e-name>noEvent</e-name>
            <event>
                <nss>INC</nss>
                <nfs>INC</nfs>
                <actions>
                    <p-name>pkgName</p-name>
                    <f-list>
                        <f-name>toF</f-name>
                        <f-arg></f-arg>
                    </f-list>
                </actions>
            </event>
        </e-list>

我正在尝试从XML2检索文本，并更新XML1中的每个元素（我不确定这是应该的样子）。这是我到目前为止被困住之前到达的地方。

I am trying to retrieve the text from XML2, and update each element in XML1 (I am not sure this is how it should be though).this is where i reached so far before i got stuck.

import xml.etree.ElementTree as ET

source = (r'C:\XML2.xml')
destination = (r'C:\XML1.xml')

source_tree = ET.parse(source)
source_root = source_tree.getroot()


dest_tree = ET.parse(destination)
dest_root = dest_tree.getroot()
xmltag = dest_root.tag

newroot = ET.Element(xmltag)


for source_elem in source_root.iter('e-list'):
    for ele_verbose in source_elem:
        newroot.append(source_elem)      
        for open_network in ele_verbose:
            newroot.append(open_network)

ET.ElementTree(newroot).write(destination, xml_declaration=True, encoding='UTF-8')   # It does write copied elements in new file and does not retain the other TAGS in XML file.

如果您有更好的方法可以实现这一点，请提出建议。

if you have any better way to achieve this please suggest.

推荐答案

下面是使用lxml进行操作的 unprofessional 方法（我对此没有太多经验） ：

Here's an unprofessional way to do it with lxml (I don't have much experience with it):

from lxml import etree

source = (r'test_xml2.xml')
destination = (r'test_xml.xml')

root1 = etree.parse(destination).getroot()
root2 = etree.parse(source).getroot()
all_elements1 = root1.findall('.//*')
all_elements2 = root2.findall('.//*')

def complete_tag_check(e1,e2):
    while e1.tag == e2.tag:
        if e1.tag == root1.tag:
            return True
        else:
            e1 = e1.getparent()
            e2 = e2.getparent()
    return False

for el2 in all_elements2:
    remove_el = False
    if el2.text is not None and el2.text.strip()!='':
        for el1 in all_elements1:

##            # this will only compare element tags
##            if el1.tag == el2.tag:
##                el1.text = el2.text
##                remove_el = True
##                break


            # this will compare the tags in each step until
            # it get to root. Only elements with exactly
            # the same structure will qualify.
            if complete_tag_check(el1,el2):
                el1.text = el2.text
                remove_el = True
                break

        # if you have multiple tags with same name in xmls,
        # the last one from xml2 will replace all in xml1.
        # to avoid this we remove each element with changed
        # text from all_elements1 list.
        if remove_el:
            all_elements1.remove(el1)


ET = etree.ElementTree(root1)
ET.write('test_xml3.xml', pretty_print=True)
# wrote to a different file so you could compare results

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