QGIS » QGIS 3.10

#!/usr/bin/python3.5

import urllib.request

url="https://wxs.ign.fr/iqqdkoa235g0mf1gr3si0162/isochrone/isochrone.xml?location=935800,6850112&srs=epsg:2154&method=Time&graph=Voiture&graphName=Voiture&exclusions=&time=1200&holes=false&smoothing=false"

request = urllib.request.Request(url)

valid="False"

try:

    response = urllib.request.urlopen(request)

    htmlBytes = response.read()

    htmlStr = htmlBytes.decode("utf8")

    print ("something cool")

    valid="True"

except:

    print("something wrong")

if valid =="True" :

    tab_iso=htmlStr

    index1=tab_iso.find("wktGeometry")

    index2=tab_iso.rfind("wktGeometry")

    index3=len(tab_iso)

    iso=tab_iso[index1+12:index2-2]

    mLayer = QgsVectorLayer('Polygon?crs=epsg:4326', "test", "memory")

    mProvider = mLayer.dataProvider()

    geomWkt= iso

    geomPoly = QgsGeometry.fromWkt(geomWkt)

    feat = QgsFeature()

    feat.setGeometry(geomPoly)

    mProvider.addFeatures( [feat] )

    mLayer.commitChanges()

    mLayer.updateExtents()

    if mLayer.isValid():

        QgsProject.instance().addMapLayer(mLayer)