使用漂亮汤python 3解析Autosar xml

Question

我试图使用Python解析AUTOSAR特定的arxml (类似于xml文件)，但无法读取文件的内容。我希望在多个DEFINITION-REF标记中获得定义的ECUC-CONTAINER-VALUE值，例如：

/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression/BswMArgumentRef

我尝试了多种方法，但我无法打印出内容。

from bs4 import BeautifulSoup as Soup

def parseArxml():
    handler = open('input.arxml').read()
    soup = Soup(handler,"html.parser")
    for ecuc_container in soup.findAll('ECUC-CONTAINER-VALUE'):
        print(ecuc_container)

if __name__ == "__main__":
    parseArxml()

下面是arxml文件的一部分：

<?xml version="1.0" encoding="UTF-8"?>
<AUTOSAR xmlns="http://autosar.org/schema/r4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://autosar.org/schema/r4.0 autosar_4-2-1.xsd">
      <ECUC-CONTAINER-VALUE UUID="c112c504-e546-41c3-abf9-0aaf06b18284">
      <SHORT-NAME>BswMLogicalExpression_2</SHORT-NAME>
      <DEFINITION-REF DEST="ECUC-PARAM-CONF-CONTAINER-DEF">/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression</DEFINITION-REF>
      <REFERENCE-VALUES>
        <ECUC-REFERENCE-VALUE>
          <DEFINITION-REF DEST="ECUC-CHOICE-REFERENCE-DEF">/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression/BswMArgumentRef</DEFINITION-REF>
          <VALUE-REF DEST="ECUC-CONTAINER-VALUE">/ARRoot/BswM_0/BswMConfig_0/BswMArbitration_0/BswMModeCondition_2</VALUE-REF>
        </ECUC-REFERENCE-VALUE>
      </REFERENCE-VALUES>
    </ECUC-CONTAINER-VALUE>

    <ECUC-CONTAINER-VALUE UUID="c112c504-e546-41c3-abf9-0aaf06b18284">
      <SHORT-NAME>BswMLogicalExpression_3</SHORT-NAME>
      <DEFINITION-REF DEST="ECUC-PARAM-CONF-CONTAINER-DEF">/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression</DEFINITION-REF>
      <REFERENCE-VALUES>
        <ECUC-REFERENCE-VALUE>
          <DEFINITION-REF DEST="ECUC-CHOICE-REFERENCE-DEF">/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression/BswMArgumentRef</DEFINITION-REF>
          <VALUE-REF DEST="ECUC-CONTAINER-VALUE">/ARRoot/BswM_2/BswMConfig_2/BswMArbitration_2/BswMModeCondition_3</VALUE-REF>
        </ECUC-REFERENCE-VALUE>
      </REFERENCE-VALUES>
    </ECUC-CONTAINER-VALUE>
</AUTOSAR>

Answer 1

在print(soup)中，您将看到解析器将标记名转换为小写。因此，在搜索标记名称时使用小写：

for ecuc_container in soup.findAll('ECUC-CONTAINER-VALUE'.lower()):

或者简单地说：

for ecuc_container in soup.findAll('ecuc-container-value'):

或者更好的是:将文档显式地解析为XML，这样标记的大小写就不会被修改：

soup = Soup(handler,'xml')

下面是如何获取<DEFINITION-REF DEST="ECUC-PARAM-CONF-CONTAINER-DEF">元素中文本的列表：

def parseArxml():
    handler = open('input.arxml').read()
    soup = Soup(handler,'xml')
    dest = [d.text for d in soup.findAll('DEFINITION-REF') if d['DEST']=='ECUC-CHOICE-REFERENCE-DEF']   
    print(dest)

输出：

['/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression/BswMArgumentRef',
'/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression/BswMArgumentRef']

或者，如果您想获取所有definition-ref标记，而不管属性是什么，请使用

dest = [d.text for d in soup.findAll('definition-ref')] 

Answer 2

似乎您的解析器和BeautifulSoup版本正在将标记转换为小写。

你应该这么做：

from bs4 import BeautifulSoup as Soup

def parseArxml():
    handler = open('input.arxml').read()
    soup = Soup(handler,"html.parser")
    for ecuc_container in soup.find_all('ecuc-container-value'):
        for def_ref in ecuc_container.find_all('definition-ref'):
            print(def_ref.get_text())

if __name__ == "__main__":
    parseArxml()

输出：

/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression
/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression/BswMArgumentRef
/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression
/AUTOSAR/ecucdef/BswM/BswMConfig/BswMArbitration/BswMLogicalExpression/BswMArgumentRef