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如何在使用Python元素树进行XML解析时检查条件

  •  0
  • Auto-learner  · 技术社区  · 7 年前

    问题: 我的列表变空了,我要尝试的条件是-如果 reference('type')=='cve'然后我想在reference中获取'id'文本 标签。

    有人能建议/纠正我获得所需的领域吗?

    我的实际代码如下:

    import xml.etree.ElementTree as ET
    
    file_name = "updateinfo.xml"
    parser = ET.XMLParser(encoding="utf-8")
    tree = ET.parse(file_name, parser=parser)
    tree_toString = (ET.tostring(tree.getroot()))
    for ele in tree.findall('update'):
        cveList = [
            ele.find('references/reference').get('id') if ele.find('references/reference').get('type') == 'cve' else None
            for cve in ele.find('references/reference')]
        print cveList
    

    <?xml version="1.0" encoding="UTF-8"?>
    <updates>
            <update status="final" from="release-engineering@redhat.com" version="4" type="enhancement" >
                <id>RHEA-2017:2259</id>
                <issued date="2017-08-01 05:59:34 UTC" />
                <title>new packages: usbguard</title>
                <release>0</release>
                <rights>Copyright 2017 Red Hat Inc</rights>
                <pushcount>4</pushcount>
                <updated date="2017-08-01 05:59:34 UTC" />
                <references>
                    <reference href="https://access.redhat.com/errata/RHEA-2017:2259" type="self" id="RHEA-2017:2259" title="RHEA-2017:2259" />
                    <reference href="https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/7.4_Release_Notes/index.html" type="other" id="ref_0" title="other_reference_0" />
                </references>
                <pkglist>
                    <collection short="" >
                        <name>rhel-7-server-rpms__7_DOT_4__x86_64</name>
                        <package src="usbguard-0.7.0-3.el7.src.rpm" name="usbguard" epoch="0" version="0.7.0" release="3.el7" arch="i686" >
                            <filename>usbguard-0.7.0-3.el7.i686.rpm</filename>
                            <sum type="sha256" >efd5ca6dd3df02e8537cf45cef48508bf023f568a98ce9f28e9baf77c5caac6c</sum>
                        </package>
                        <package src="usbguard-0.7.0-3.el7.src.rpm" name="usbguard" epoch="0" version="0.7.0" release="3.el7" arch="x86_64" >
                            <filename>usbguard-0.7.0-3.el7.x86_64.rpm</filename>
                            <sum type="sha256" >3f72768880085d6bfff37636d3a8eb54184e5619353b5efbefd5738e74bdfa08</sum>
                        </package>
                    </collection>
                </pkglist>
            </update>
            <update status="final" from="security@redhat.com" version="1" type="bugfix" >
                <id>RHBA-2014:0722</id>
                <issued date="2014-06-10 00:00:00" />
                <title>kexec-tools bug fix update</title>
                <rights>Copyright 2014 Red Hat Inc</rights>
                <pushcount>1</pushcount>
                <updated date="2014-06-10 00:00:00" />
                <references>
                    <reference href="https://rhn.redhat.com/errata/RHBA-2014-0722.html" type="self" title="RHBA-2014:0722" />
                </references>
                <pkglist>
                    <collection short="" >
                        <name>rhel-7-server-rpms__7_DOT_4__x86_64</name>
                        <package src="kexec-tools-2.0.4-32.el7_0.1.src.rpm" name="kexec-tools" epoch="0" version="2.0.4" release="32.el7_0.1" arch="x86_64" >
                            <filename>kexec-tools-2.0.4-32.el7_0.1.x86_64.rpm</filename>
                            <sum type="sha256" >8e214681104e4ba73726e0ce11d21b963ec0390fd70458d439ddc72372082034</sum>
                        </package>
                    </collection>
                </pkglist>
            </update>
            <update status="final" from="release-engineering@redhat.com" version="4" type="security" >
                <id>RHSA-2017:2831</id>
                <issued date="2017-09-28 18:56:55 UTC" />
                <title>Critical: firefox security update</title>
                <release>0</release>
                <rights>Copyright 2017 Red Hat Inc</rights>
                <severity>Critical</severity>
                <pushcount>4</pushcount>
                <updated date="2017-09-28 18:56:56 UTC" />
                <references>
                    <reference href="https://access.redhat.com/errata/RHSA-2017:2831" type="self" id="RHSA-2017:2831" title="RHSA-2017:2831" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1496649" type="bugzilla" id="1496649" title="CVE-2017-7793 Mozilla: Use-after-free with Fetch API (MFSA 2017-22)" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1496651" type="bugzilla" id="1496651" title="CVE-2017-7810 Mozilla: Memory safety bugs fixed in Firefox 56 and Firefox ESR 52.4 (MFSA 2017-22)" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1496652" type="bugzilla" id="1496652" title="CVE-2017-7814 Mozilla: Blob and data URLs bypass phishing and malware protection warnings (MFSA 2017-22)" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1496653" type="bugzilla" id="1496653" title="CVE-2017-7818 Mozilla: Use-after-free during ARIA array manipulation (MFSA 2017-22)" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1496654" type="bugzilla" id="1496654" title="CVE-2017-7819 Mozilla: Use-after-free while resizing images in design mode (MFSA 2017-22)" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1496655" type="bugzilla" id="1496655" title="CVE-2017-7823 Mozilla: CSP sandbox directive did not create a unique origin (MFSA 2017-22)" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1496656" type="bugzilla" id="1496656" title="CVE-2017-7824 Mozilla: Buffer overflow when drawing and validating elements with ANGLE (MFSA 2017-22)" />
                    <reference href="https://www.redhat.com/security/data/cve/CVE-2017-7793.html" type="cve" id="CVE-2017-7793" title="CVE-2017-7793" />
                    <reference href="https://www.redhat.com/security/data/cve/CVE-2017-7810.html" type="cve" id="CVE-2017-7810" title="CVE-2017-7810" />
                    <reference href="https://www.redhat.com/security/data/cve/CVE-2017-7814.html" type="cve" id="CVE-2017-7814" title="CVE-2017-7814" />
                    <reference href="https://www.redhat.com/security/data/cve/CVE-2017-7818.html" type="cve" id="CVE-2017-7818" title="CVE-2017-7818" />
                    <reference href="https://www.redhat.com/security/data/cve/CVE-2017-7819.html" type="cve" id="CVE-2017-7819" title="CVE-2017-7819" />
                    <reference href="https://www.redhat.com/security/data/cve/CVE-2017-7823.html" type="cve" id="CVE-2017-7823" title="CVE-2017-7823" />
                    <reference href="https://www.redhat.com/security/data/cve/CVE-2017-7824.html" type="cve" id="CVE-2017-7824" title="CVE-2017-7824" />
                    <reference href="https://access.redhat.com/security/updates/classification/#critical" type="other" id="classification" title="critical" />
                    <reference href="https://www.mozilla.org/en-US/security/advisories/mfsa2017-22/" type="other" id="ref_0" title="other_reference_0" />
                </references>
                <pkglist>
                    <collection short="" >
                        <name>rhel-7-server-rpms__7_DOT_4__x86_64</name>
                        <package src="firefox-52.4.0-1.el7_4.src.rpm" name="firefox" epoch="0" version="52.4.0" release="1.el7_4" arch="x86_64" >
                            <filename>firefox-52.4.0-1.el7_4.x86_64.rpm</filename>
                            <sum type="sha256" >7b81b37bf969534bee0152bc13db56ae410eee06120a78d8da261c10c73c0514</sum>
                        </package>
                    </collection>
                </pkglist>
            </update>
            <update status="final" from="release-engineering@redhat.com" version="2" type="bugfix" >
                <id>RHBA-2016:2423</id>
                <issued date="2016-11-03 06:09:21 UTC" />
                <title>oscap-anaconda-addon bug fix update</title>
                <release>0</release>
                <rights>Copyright 2016 Red Hat Inc</rights>
                <severity>None</severity>
                <pushcount>2</pushcount>
                <updated date="2016-11-03 06:10:44 UTC" />
                <references>
                    <reference href="https://access.redhat.com/errata/RHBA-2016:2423" type="self" id="RHBA-2016:2423" title="RHBA-2016:2423" />
                    <reference href="https://bugzilla.redhat.com/show_bug.cgi?id=1269211" type="bugzilla" id="1269211" title="could move security section down to bottom since it's not as important as network spoke" />
                </references>
                <pkglist>
                    <collection short="" >
                        <name>rhel-7-server-rpms__7_DOT_4__x86_64</name>
                        <package src="oscap-anaconda-addon-0.7-12.el7.src.rpm" name="oscap-anaconda-addon" epoch="0" version="0.7" release="12.el7" arch="noarch" >
                            <filename>oscap-anaconda-addon-0.7-12.el7.noarch.rpm</filename>
                            <sum type="sha256" >507fbf46ddaed0bb4087d3ef2b31db235473f3be36aaa9ed7df43279ed7e2f07</sum>
                        </package>
                    </collection>
                </pkglist>
            </update>
    
    2 回复  |  直到 7 年前
        1
  •  1
  •   stovfl    7 年前

    问题


    你要做的是 解析,因为此行已经完成了解析:

    tree = ET.parse(file_name, parser=parser)
    

    你不需要通过 parser=XMLParser
    阅读参考: xml.etree.ElementTree.parse

    您的示例代码循环 ElementTree 四次

    for ele in tree.findall('update'):
        cveList = [
            ele.find('references/reference').get('id') if ele.find('references/reference').get('type') == 'cve' else None
            for cve in ele.find('references/reference')]
    

    .find... ,将循环,直到找到所请求的元素为止。

    你可以得到所有 reference 元素

    import xml.etree.ElementTree as ET
    
    file_name = "test/updateinfo.xml"
    tree = ET.parse(file_name)
    
    cveList = []
    for reference in tree.findall('update/references/reference'):
        if reference.attrib.get('type') == 'cve':
            cveList.append(reference.attrib.get('id'))
    
    print(cveList)
    

    :

    ['CVE-2017-7793', 'CVE-2017-7810', 'CVE-2017-7814', 'CVE-2017-7818', 'CVE-2017-7819', 'CVE-2017-7823', 'CVE-2017-7824']
    

    评论

    # Findall 'update' Elements in tree
    for update in tree.findall('update'):
        # Findall 'references/reference' in update
        for reference in update.findall('references/reference'):
            if reference.attrib.get('type') == 'cve':
                # Find Element with tag <title> in update
                title = update.find('title').text
                # Append a Dict with keys 'title' and 'id'
                cveList.append({'title': title, 'id': reference.get('id')})
    

    [{'id': 'CVE-2017-7793', 'title': 'Critical: firefox security update'}, {'id': 'CVE-2017-7810', 'title': 'Critical: firefox security update'}, {'id': 'CVE-2017-7814', 'title': 'Critical: firefox security update'}, {'id': 'CVE-2017-7818', 'title': 'Critical: firefox security update'}, {'id': 'CVE-2017-7819', 'title': 'Critical: firefox security update'}, {'id': 'CVE-2017-7823', 'title': 'Critical: firefox security update'}, {'id': 'CVE-2017-7824', 'title': 'Critical: firefox security update'}]
    

    用P测试ython:2.7.9

        2
  •  0
  •   DisappointedByUnaccountableMod brnfd    7 年前

    ele.find(...).get(‘id’) cve.find(‘id’) 而不是 ele.find(...).get(‘type’) 使用 cve.get(‘type’)