Python 如何从XML文件中准确地获取子节点和该节点中的数据
我的XML文件Python 如何从XML文件中准确地获取子节点和该节点中的数据,python,xml,python-2.7,lxml,Python,Xml,Python 2.7,Lxml,我的XML文件 <?xml version="1.0" encoding="utf-8"?> <group xmlns='http://www.xbrl.org/2001/instance' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:iso4217='http://www.xbrlSolutions.com/taxonomies/iso4217/2002-0
<?xml version="1.0" encoding="utf-8"?>
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xmlns:iascf-pfs='http://www.xbrl.org/taxonomy/int/fr/ias/ci/pfs/2002-11-15'
xmlns:novartis='http://www.xbrl.org/taxonomy/int/fr/ias/pfs/2002-11-15/Novartis-2002-11-15'
xsi:schemaLocation='
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http://www.xbrl.org/taxonomy/int/fr/ias/ci/pfs/2002-11-15 ias-ci-pfs-2002-11-15-WINDOW.xsd
http://www.xbrl.org/taxonomy/int/fr/ias/pfs/2002-11-15/Novartis-2002-11-15 Novartis-2002-11-15.xsd
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<novartis:EffectAgribusinessSpinOff numericContext='Group2000ForPeriod'>-109000000</novartis:EffectAgribusinessSpinOff>
<novartis:ReservesTotalChangesEffectAgribusinessSpinOff numericContext='Group2000ForPeriod'>-3764000000</novartis:ReservesTotalChangesEffectAgribusinessSpinOff>
<novartis:EquityTotalChangesEffectAgribusinessSpinOff numericContext='Group2000ForPeriod'>-3764000000</novartis:EquityTotalChangesEffectAgribusinessSpinOff>
<iascf-pfs:TranslationReservesChangesForeignCurrencyTranslationEffect numericContext='Group2000ForPeriod'>-571000000</iascf-pfs:TranslationReservesChangesForeignCurrencyTranslationEffect>
<novartis:ForeignCurrencyTranslationEffect numericContext='Group2000ForPeriod'>-571000000</novartis:ForeignCurrencyTranslationEffect>
<iascf-pfs:EquityTotalChangesForeignCurrencyTranslationEffect numericContext='Group2000ForPeriod'>-571000000</iascf-pfs:EquityTotalChangesForeignCurrencyTranslationEffect>
</group>
32038000000
35805000000
numericContextnumericContextlxmlfrom lxml import etree
tree = etree.parse("XMLData.xml")
root = tree.getroot()
root.findall('iascf-pfs:RevenueFunction', root.nsmap)
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
<ipython-input-21-37cc8ca4da37> in <module>()
2 tree = etree.parse("XMLData.xml")
3 root = tree.getroot()
----> 4 root.findall('RevenueFunction', root.nsmap)
5
src/lxml/lxml.etree.pyx in lxml.etree._Element.findall (src\lxml\lxml.etree.c:61450)()
c:\pandas\venv\lib\site-packages\lxml-3.5.0-py2.7-win32.egg\lxml\_elementpath.pyc in findall(elem, path, namespaces)
302
303 def findall(elem, path, namespaces=None):
--> 304 return list(iterfind(elem, path, namespaces))
305
306
c:\pandas\venv\lib\site-packages\lxml-3.5.0-py2.7-win32.egg\lxml\_elementpath.pyc in iterfind(elem, path, namespaces)
275
276 def iterfind(elem, path, namespaces=None):
--> 277 selector = _build_path_iterator(path, namespaces)
278 result = iter((elem,))
279 for select in selector:
c:\pandas\venv\lib\site-packages\lxml-3.5.0-py2.7-win32.egg\lxml\_elementpath.pyc in _build_path_iterator(path, namespaces)
232 """compile selector pattern"""
233 if namespaces and (None in namespaces or '' in namespaces):
--> 234 raise ValueError("empty namespace prefix is not supported in ElementPath")
235 if path[-1:] == "/":
236 path += "*" # implicit all (FIXME: keep this?)
ValueError: empty namespace prefix is not supported in ElementPath
---------------------------------------------------------------------------
ValueError回溯（最近一次调用上次）
在（）
2 tree=etree.parse（“XMLData.xml”）
3 root=tree.getroot（）
---->4 root.findall（'RevenueFunction'，root.nsmap）
5.
lxml.etree.\u Element.findall中的src/lxml/lxml.etree.pyx（src\lxml\lxml.etree.c:61450）（）
c:\pandas\venv\lib\site packages\lxml-3.5.0-py2.7-win32.egg\lxml\\u elementpath.pyc（元素、路径、名称空间）
302
303 def findall（元素、路径、名称空间=无）：
-->304返回列表（iterfind（元素、路径、名称空间））
305
306
c:\pandas\venv\lib\site packages\lxml-3.5.0-py2.7-win32.egg\lxml\\u elementpath.pyc在iterfind中（元素、路径、名称空间）
275
276 def iterfind（元素、路径、名称空间=无）：
-->277选择器=\构建\路径\迭代器（路径，名称空间）
278结果=国际热核实验堆
279对于选择输入选择器：
c:\pandas\venv\lib\site packages\lxml-3.5.0-py2.7-win32.egg\lxml\\u elementpath.pyc在构建路径迭代器（路径，名称空间）中
232“编译选择器模式”
233如果名称空间和（名称空间中无或名称空间中为“”）：
-->234 raise VALUERROR（“ElementPath中不支持空命名空间前缀”）
235如果路径[-1::]=“/”：
236路径+=“*”#隐式全部（修复程序：保留此？）
ValueError:ElementPath中不支持空命名空间前缀
from lxml import etree
tree = etree.parse("XMLData.xml")
root = tree.getroot()
for x in root.findall('iascf-pfs:RevenueFunction', root.nsmap):
print(x.get('numericContext'))
from lxml import etree
tree = etree.parse("XMLData.xml")
root = tree.getroot()
for x in root.findall('iascf-pfs:RevenueFunction', root.nsmap):
print(x.get('numericContext'))
此解决方案使用child.tag在所有节点中搜索包含“RevenueFunction”的子节点：
import xml.etree.ElementTree as ET
tree = ET.parse('XMLData.xml')
root = tree.getroot()
for child in root:
if 'RevenueFunction' in child.tag:
print child.text
3203800000035805000000import xml.etree.ElementTree as ET
tree = ET.parse('XMLData.xml')
root = tree.getroot()
for child in root:
if 'RevenueFunction' in child.tag:
print child.text
import xml.etree.ElementTree as ET
import re
tree = ET.parse('XMLData.xml')
root = tree.getroot()
ns = {'real_data': 'http://www.xbrl.org/taxonomy/int/fr/ias/ci/pfs/2002-11-15'}
Stand_Net_Sales={}
for data in root.findall('real_data:RevenueFunction', ns):
Stand_Net_Sales[int(re.sub("\D", "", data.attrib['numericContext']))] = float(data.text)
print Stand_Net_Sales
3203800000035805000000import xml.etree.ElementTree as ET
import re
tree = ET.parse('XMLData.xml')
root = tree.getroot()
ns = {'real_data': 'http://www.xbrl.org/taxonomy/int/fr/ias/ci/pfs/2002-11-15'}
Stand_Net_Sales={}
for data in root.findall('real_data:RevenueFunction', ns):
Stand_Net_Sales[int(re.sub("\D", "", data.attrib['numericContext']))] = float(data.text)
print Stand_Net_Sales
{2000: 35805000000.0, 2001: 32038000000.0}
{2000: 35805000000.0, 2001: 32038000000.0}
错误：
ValueError:ElementPath中不支持空命名空间前缀iascf pfs:iascf pfs:ValueError:ElementPath中不支持空名称空间前缀iascf pfs:iascf pfs: