如何解决ElementTree 没有找到时间元素
在这个 XML 中,我试图找到所有时间元素。 (例如 2020-12-10T19:45:20.370Z)
<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="https://github.com/juanirache/gopro-telemetry">
<trk>
<name>GH017545.MP4</name>
<desc>30 fps - GPS (Lat.,Long.,Alt.,2D speed,3D speed) - [deg,deg,m,m/s,m/s]</desc>
<src>Hero7 Black</src>
<trkseg>
<trkpt lat="49.0624274" lon="13.7796753">
<ele>724.267</ele>
<time>2020-12-10T19:45:20.370Z</time>
<fix>2d</fix>
<hdop>604</hdop>
<geoidheight>46.94805809874912</geoidheight>
<cmt>2dSpeed: 0.191; 3dSpeed: 0.17</cmt>
</trkpt>
<trkpt lat="49.0624294" lon="13.7796749">
<ele>723.93</ele>
<time>2020-12-10T19:45:20.425Z</time>
<fix>2d</fix>
<hdop>604</hdop>
<geoidheight>46.94805809874912</geoidheight>
<cmt>2dSpeed: 0.218; 3dSpeed: 0.19</cmt>
</trkpt>
...
...
...
但这并没有返回任何东西。你能帮忙吗?
import xml.etree.ElementTree as ET
tree = ET.parse('sample 1.xml')
root = tree.getroot()
for x in root.findall('.//time'):
print(x.text)
解决方法
你在这里纠结于命名空间。有几种方法可以处理它;最简单的就是这个,我相信:
times = """<?xml version="1.0" encoding="UTF-8"?>
<gpx xmlns="http://www.topografix.com/GPX/1/1" version="1.1" creator="https://github.com/juanirache/gopro-telemetry">
<trk>
<name>GH017545.MP4</name>
<desc>30 fps - GPS (Lat.,Long.,Alt.,2D speed,3D speed) - [deg,deg,m,m/s,m/s]</desc>
<src>Hero7 Black</src>
<trkseg>
<trkpt lat="49.0624274" lon="13.7796753">
<ele>724.267</ele>
<time>2020-12-10T19:45:20.370Z</time>
<fix>2d</fix>
<hdop>604</hdop>
<geoidheight>46.94805809874912</geoidheight>
<cmt>2dSpeed: 0.191; 3dSpeed: 0.17</cmt>
</trkpt>
<trkpt lat="49.0624294" lon="13.7796749">
<ele>723.93</ele>
<time>2020-12-10T19:45:20.425Z</time>
<fix>2d</fix>
<hdop>604</hdop>
<geoidheight>46.94805809874912</geoidheight>
<cmt>2dSpeed: 0.218; 3dSpeed: 0.19</cmt>
</trkpt>
</trkseg>
</trk>
</gpx>"""
from lxml import etree
doc = etree.XML(times.encode())
for t in doc.xpath('//*[local-name()="time"]/text()'):
print(t)
输出:
2020-12-10T19:45:20.370Z
2020-12-10T19:45:20.425Z
,
你必须使用包含命名空间的全限定标签:
for element in root.findall('.//{http://www.topografix.com/GPX/1/1}time'):
print(element.text)
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