需要使用Python生成包含xml内容（不仅仅是文本）的子元素

Question

我不熟悉python和xml。我正在使用python生成一个xml文件。这个xml文件将每天根据一些输入配置文件生成。 在xml文件中创建子元素时需要一些帮助。因为它不是在正确的父元素下生成的。请输入当前和期望的输出。你知道吗

我有一个包装器python脚本和生成器python脚本。 发电机

包装脚本：

        with workflow.SubWFAction() as a:
            inp_list = [('catg','first')]
            a.app_path(TEST_FILE)
            a.configsec(inp_list)
            wf.insert_action(a)

---

发电机Py sript：

from xml.etree import ElementTree
from xml.etree.ElementTree import Element
from xml.etree.ElementTree import SubElement
from xml.dom import minidom

class Workflow:
    def __init__(self, name, namespace=WF_NAMESPACE):
        self.xml = Element('workflow-app')
        self.action_counter = 0
    def insert_action(self, action):

class Action:
    def __init__(self):
        self.xml = Element('action')
        self._position = 0

class SubWFAction(Action):
    def __init__(self):
        Action.__init__(self)
        action_type = 'sub-workflow'
        self.xml.set('name', action_type)
        this_node = Element(action_type)
        self.xml.insert(self._position, this_node)
        self.sub_workflow = self.xml[self._position]

    def app_path(self, inner_text):
        node = SubElement(self.sub_workflow, 'app-path')
        cpnode = SubElement(self.sub_workflow, 'propagate-configuration')
        node.text = inner_text

    def configsec(self, inp_list):
        configuration = SubElement(self.sub_workflow, 'configuration')
        proptext = [self.property(prop[0], prop[1]) for prop in inp_list]
        return proptext

    def property(self, key, value):
        property = SubElement(self.xml,'property')
        name = SubElement(property,'name')
        name.text = key
        val = SubElement(property,'value')
        val.text = value

电流输出：

<?xml version="1.0" encoding="UTF-8"?>
<workflow-app name="wf_ntflx_genr" xmlns="uri:oozie:workflow:0.5">
    <start to="sub-workflow"/>
    <action name="sub-workflow">
        <sub-workflow>
            <app-path>
              /ntflx/tesfile.dat
            </app-path>
            <propagate-configuration/>
            <configuration/>
        </sub-workflow>
        <configuration/>
        <ok to="end"/>
        <error to="kill"/>
        <property>
            <name>
                catg
            </name>
            <value>
                first
            </value>
        </property>
    </action>

期望输出：

<?xml version="1.0" encoding="UTF-8"?>
<workflow-app name="wf_ntflx_genr" xmlns="uri:oozie:workflow:0.5">
    <start to="sub-workflow"/>
    <action name="sub-workflow">
        <sub-workflow>
            <app-path>
              /ntflx/tesfile.dat
            </app-path>
            <propagate-configuration/>
            <configuration>
                <property>
                    <name>
                        catg
                    </name>
                    <value>
                        first
                    </value>
                </property>
            </configuration>
        </sub-workflow>
        <ok to="end"/>
        <error to="kill"/>
    </action>

请帮帮我！你知道吗

Answer 1

您希望<property>位于<configuration>之下，因此需要向SubElement提供正确的元素。你可以用几种方法来做，但我不确定哪种方法对你的整体设计最有意义。但是一种方法是跟踪当前的配置，并让property将其数据放到其中。我注意到代码中有一个潜在的错误。。。你知道吗

def configsec(self, inp_list):
    # Changed: Remember the current configuration element so that
    # properties can be applied
    self.configuration = SubElement(self.sub_workflow, 'configuration')
    # TODO: this creates properties in the xml but since `property` 
    # returns `None` you return a list of `None`s here.
    proptext = [self.property(prop[0], prop[1]) for prop in inp_list]
    return proptext

def property(self, key, value):
    # changed: set the property element on the current configuration
    property = SubElement(self.configuration,'property')
    name = SubElement(property,'name')
    name.text = key
    val = SubElement(property,'value')
    val.text = value