我想更改以下代码以获取，file_names并且file_paths仅当fastboot="true"父标记中存在属性时，我才提供当前的输出和预期的输出，有人可以提供如何执行操作的指南吗？
import sys
import os
import string
from xml.dom import minidom
if __name__ == '__main__':
meta_contents = minidom.parse("fast.xml")
builds_flat = meta_contents.getElementsByTagName("builds_flat")[0]
build_nodes = builds_flat.getElementsByTagName("build")
for build in build_nodes:
bid_name = build.getElementsByTagName("name")[0]
print "Checking if this is cnss related image... : \n"+bid_name.firstChild.data
if (bid_name.firstChild.data == 'apps'):
file_names = build.getElementsByTagName("file_name")
file_paths = build.getElementsByTagName("file_path")
print "now files paths...\n"
for fn,fp in zip(file_names,file_paths):
if (not fp.firstChild.nodeValue.endswith('/')):
fp.firstChild.nodeValue = fp.firstChild.nodeValue + '/'
full_path = fp.firstChild.nodeValue+fn.firstChild.nodeValue
print "file-to-copy: "+full_path
break
输入XML：
<builds_flat>
<build>
<name>apps</name>
<file_ref ignore="true" minimized="true">
<file_name>adb.exe</file_name>
<file_path>LINUX/android/vendor/qcom/proprietary/usb/host/windows/prebuilt/</file_path>
</file_ref>
<file_ref ignore="true" minimized="true">
<file_name>system.img</file_name>
<file_path>LINUX/android/out/target/product/msmcobalt/secondary-boot/</file_path>
</file_ref>
<download_file cmm_file_var="APPS_BINARY" fastboot_rumi="boot" fastboot="true" minimized="true">
<file_name>boot.img</file_name>
<file_path>LINUX/android/out/target/product/msmcobalt/</file_path>
</download_file>
<download_file sparse_image_path="true" fastboot_rumi="abl" fastboot="true" minimized="true">
<file_name>abl.elf</file_name>
<file_path>LINUX/android/out/target/product/msmcobalt/</file_path>
</download_file>
</build>
</builds_flat>
输出：-
...............
now files paths...
file-to-copy: LINUX/android/vendor/qcom/proprietary/usb/host/windows/prebuilt/adb.exe
file-to-copy: LINUX/android/out/target/product/msmcobalt/secondary-boot/system.img
file-to-copy: LINUX/android/out/target/product/msmcobalt/boot.img
file-to-copy: LINUX/android/out/target/product/msmcobalt/abl.elf
预期：
now files paths...
........
file-to-copy: LINUX/android/out/target/product/msmcobalt/boot.img
file-to-copy: LINUX/android/out/target/product/msmcobalt/abl.elf
我想到的是一种很快而又肮脏的东西，它使用的事实是只有download_file元素才具有fastboot属性，对吗？如果是这种情况，您始终可以获取type的子代download_file并过滤其fastboot属性不是的子代"true"：
import os
from xml.dom import minidom
if __name__ == '__main__':
meta_contents = minidom.parse("fast.xml")
for elem in meta_contents.getElementsByTagName('download_file'):
if elem.getAttribute('fastboot') == "true":
path = elem.getElementsByTagName('file_path')[0].firstChild.nodeValue
file_name = elem.getElementsByTagName('file_name')[0].firstChild.nodeValue
print os.path.join(path, file_name)
使用您提供的样本输出：
$ python ./stack_034.py
LINUX/android/out/target/product/msmcobalt/boot.img
LINUX/android/out/target/product/msmcobalt/abl.elf
不用说...因为没有.xsd文件（minidom尽管也没有关系，但是）只得到字符串（没有类型安全性），并且这仅适用于示例中显示的结构（您可能希望添加一些内容）那里有额外的检查，这是我的意思）
编辑：根据此答案中的注释：
要获取<build>其中包含<name>具有value属性的元素apps，您可以：找到该<name>标签（其值为字符串的标签apps），然后移至父节点（将您置于build元素中），然后按上述步骤进行操作：
if __name__ == '__main__':
meta_contents = minidom.parse("fast.xml")
for elem in meta_contents.getElementsByTagName('name'):
if elem.firstChild.nodeValue == "apps":
apps_build = elem.parentNode
for elem in apps_build.getElementsByTagName('download_file'):
if elem.getAttribute('fastboot') == "true":
path = elem.getElementsByTagName('file_path')[0].firstChild.nodeValue
file_name = elem.getElementsByTagName('file_name')[0].firstChild.nodeValue
print os.path.join(path, file_name)
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