用Python将XML转换为csv文件

Question

我正在尝试将xml文件转换为csv。文件看起来像这样:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<tns:FlxPtn xmlns:ts2c="http://interop.covea.fr/Covea-Flx-TypesS2C-009" xmlns:tns="http://interop.covea.fr/Covea-App-PolRntVie-024" xmlns:rf2c="http://interop.covea.fr/Covea-Referentiel" xmlns:cov="http://interop.covea.fr/Covea-FlxPtn-002" xmlns:fs2c="http://interop.covea.fr/Covea-Flx-EneFncS2C-007" xsi:schemaLocation="http://interop.covea.fr/Covea-Flx-TypesS2C-009 Covea-Flx-TypesS2C-009.xsd http://interop.covea.fr/Covea-App-PolRntVie-024 S2C_XSD_VIGERIRVES_V10.0_024_MMA_124.xsd http://interop.covea.fr/Covea-App-PolRntVie-024 S2C_XSD_VIGERIRVES_V10.0_024.xsd http://interop.covea.fr/Covea-Referentiel Covea-Referentiel.xsd http://interop.covea.fr/Covea-FlxPtn-002 Covea-FlxPtn-002.xsd http://interop.covea.fr/Covea-Flx-EneFncS2C-007 Covea-Flx-EneFncS2C-007.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<cov:DonEneTch>
<cov:IdVrsEne>002</cov:IdVrsEne>
<cov:IdFlx>1V400220191231VIGERIRVESMMA1</cov:IdFlx>
<cov:TsCraFlx>2020-01-13 10.02.13.000000</cov:TsCraFlx>
<cov:IdEmtFlx>MMA</cov:IdEmtFlx>
<cov:IdRctFlx>MMA</cov:IdRctFlx>
<cov:TyFlx>NOTIF</cov:TyFlx>
<cov:TyTrtFlx>1</cov:TyTrtFlx>
<cov:AquFlx>0</cov:AquFlx>
<cov:EvrExu>PRODUCTION</cov:EvrExu>
<cov:IdApnEmt>MMA</cov:IdApnEmt>
<cov:AcnApl>VIGERIRVES</cov:AcnApl>
<cov:IdVrsFlx>124</cov:IdVrsFlx>
<cov:IdTrtEmt>Rentes Vie</cov:IdTrtEmt>
<cov:IdUtl>TTBATCH</cov:IdUtl>
<cov:VrsCbl></cov:VrsCbl>
<cov:ChpLbr>1V400220191231VIGERIRVESMMA1377900</cov:ChpLbr>
</cov:DonEneTch>
<tns:DonMet>
<tns:DonEneFnc>
<fs2c:CodSocJur>1V4002</fs2c:CodSocJur>
<fs2c:DatArr>20191231</fs2c:DatArr>
<fs2c:TypFiColl>VIGERIRVES</fs2c:TypFiColl>
<fs2c:TimStmCreFic>2020-01-13 10.02.13.000000</fs2c:TimStmCreFic>
<fs2c:CodEns>MMA</fs2c:CodEns>
</tns:DonEneFnc>
<tns:PolRntVie>
<tns:NumEnr>20191290</tns:NumEnr>
<tns:NumPol>050000111901</tns:NumPol>
<tns:PMVie>997.75</tns:PMVie>
</tns:PolRntVie>
<tns:PolRntVie>
<tns:NumEnr>20191291</tns:NumEnr>
<tns:NumPol>050000112002</tns:NumPol>
<tns:PMVie>4385.15</tns:PMVie>
</tns:PolRntVie>

我想提取的是最后一部分信息" numen"， "NumPol"， " pmview "

我试着调整一些代码示例如下，但我对xml不够熟悉，使其工作

import pandas as pd
from xml.etree import ElementTree as et
import csv
libname = "C:/Users/a61787/Documents/"
tree = ET.parse(libname+'rente.xml')
with open(libname+'b.csv','w',newline='',encoding='utf8') as sitescope_data:
csvwriter = csv.writer(sitescope_data)
col_names = 'Numenr NumPol PMVie'.split()
csvwriter.writerow(col_names)
for event in tree.findall('tns:DonMet/tns:PolRntVie'):
event_data = ['' if (e:=event.find(col)) is None else e.text for col in col_names]
csvwriter.writerow(event_data)
dataframe = pd.read_csv('b.csv',encoding='utf8')
print(dataframe.shape)

给我一个空的DF，只有colname。

最后我想得到的是下表:

Numenr      NumPol          PMVie
20191290    050000111901    997.75
20191291    050000112002    4385.15

如果你有什么主意，我将不胜感激

Answer 1

您可以使用beautifulsoup这样做:

from bs4 import BeautifulSoup
import csv
with open('rente.xml') as f_input:
soup = BeautifulSoup(f_input, "lxml")
with open('b.csv', 'w', newline='', encoding='utf-8') as f_output:
csv_output = csv.writer(f_output)
csv_output.writerow(['Numenr', 'NumPol', 'PMVie'])

for tns in soup.find_all("tns:polrntvie"):
csv_output.writerow(tns.find(entry).text for entry in ['tns:numenr', 'tns:numpol', 'tns:pmvie'])

这将给你一个b.csv文件包含:

Numenr,NumPol,PMVie
20191290,050000111901,997.75
20191291,050000112002,4385.15

---

如果缺项:

from bs4 import BeautifulSoup
import csv
with open('rente.xml') as f_input:
soup = BeautifulSoup(f_input, "lxml")
with open('b.csv', 'w', newline='', encoding='utf-8') as f_output:
csv_output = csv.writer(f_output)
csv_output.writerow(['Numenr', 'NumPol', 'PMVie'])

for tns in soup.find_all("tns:polrntvie"):
row = []

for entry in ['tns:numenr', 'tns:numpol', 'tns:pmvie']:
try:
row.append(tns.find(entry).text)
except AttributeError:
row.append('')

csv_output.writerow(row)