[英]path to element with conditions on parent(s) attributes using xpath,lxml,python
我正在使用lxml進行項目。 這是一個示例xml
<PatientsTree>
<Patient PatientID="SKU065427">
<Study StudyInstanceUID="25.2.9.2.1107.5.1.4.49339.30000006050107501192100000001">
<Series SeriesInstanceUID="2.16.840.1.113669.1919.1176798690"/>
<Series SeriesInstanceUID="2.16.840.1.113669.1919.1177084041"/>
<Series SeriesInstanceUID="25.2.9.2.1107.5.1.4.49339.30000006050108064034300000000"/>
</Study>
</Patient>
<Patient PatientID="SKU55527">
<Study StudyInstanceUID="25.2.9.2.1107.5.1.4.49339.30000006120407393721800000007">
<Series SeriesInstanceUID="2.16.840.1.113669.1919.1198835144"/>
</Study>
<Study StudyInstanceUID="25.2.9.2.1107.5.1.4.49339.30000007010207164403100000013">
<Series SeriesInstanceUID="2.16.840.1.113669.1919.1198835358"/>
</Patient>
</PatientsTree>
假設我想帶條件到達系列元素
我的結果將是:
<Series SeriesInstanceUID="2.16.840.1.113669.1919.1198835358"/>
如果我能理解這種解決方案,那么我將在學習xml方面走近一步。 PS我正在使用python和lxml和xpath
import lxml.etree as le
with open('data.xml') as f:
doc=le.parse( f )
patientID="SKU55527"
studyInstanceUID="25.2.9.2.1107.5.1.4.49339.30000007010207164403100000013"
xpath='''\
/PatientsTree
/Patient[@PatientID="{p}"]
/Study[@StudyInstanceUID="{s}"]
/Series'''.format(p=patientID,s=studyInstanceUID)
seriesInstanceUID=doc.xpath(xpath)
for node in seriesInstanceUID:
print(node.attrib)
# {'SeriesInstanceUID': '2.16.840.1.113669.1919.1198835358'}
此XPath表達式:
/PatientsTree
/Patient[@PatientID='SKU55527']
/Study[@StudyInstanceUID =
'25.2.9.2.1107.5.1.4.49339.30000007010207164403100000013']
/Series
在此節點中選擇的結果:
<Series SeriesInstanceUID="2.16.840.1.113669.1919.1198835358"/>
如果要本地使用lxml而不是xpath :(否則,unutbu的解決方案是完美的)
from lxml import etree as ET
tree = ET.parse('some_file.xml')
patientID="SKU55527"
studyInstanceUID="25.2.9.2.1107.5.1.4.49339.30000007010207164403100000013"
patient_node = tree.find(patientID)
if not patient_node is None:
study_node = patient_node.find(studyInstanceUID)
if not study_node is None:
for child in study_node.getchildren():
print child.attrib
#or do whatever useful thing you want
else:
#didn't find the study
else:
#didn't find the node
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