python - python3 xpath can't reach a child node (AttributeError: 'NoneType' object has no attribute 'text') -

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need issue didn't manage find

have xml this:

<forecast xmlns="http://weather.yandex.ru/forecast" country_id="8996ba26eb0edf7ea5a055dc16c2ccbd" part="Лен Стокгольм" link="http://pogoda.yandex.ru/stockholm/" part_id="53f767b78d8f180c28d55ebda1d07e0c" lat="59.381981" slug="stockholm" city="Стокгольм" climate="1" country="Швеция" region="10519" lon="17.956846" zoom="12" id="2464" source="station" exactname="Стокгольм" geoid="10519"> <fact>...</fact> <yesterday id="435077826">...</yesterday> <informer>...</informer> <day date="2016-04-18">     <sunrise>05:22</sunrise>     <sunset>20:12</sunset>     <moon_phase code="growing-moon">14</moon_phase>     <moonrise>15:53</moonrise>     <moonset>04:37</moonset>     <biomet index="3" geomag="2" low_press="1" uv="1">...</biomet>     <day_part typeid="1" type="morning">...</day_part>     <day_part typeid="2" type="day">...</day_part>     <day_part typeid="3" type="evening">...</day_part>     <day_part typeid="4" type="night">...</day_part>     <day_part typeid="5" type="day_short">         <temperature>11</temperature>     </day_part> </day> </forecast>

(the entire xml reached @ https://export.yandex.ru/weather-ng/forecasts/2464.xml). need temperature.text (11), trying code:

import urllib.request import codecs import lxml xml.etree import elementtree et  def gen_ns(tag):     if tag.startswith('{'):         ns, tag = tag.split('}')          return ns[1:]     else:         return '' codecs.open(fname, 'r', encoding = 'utf-8') t:         town_tree = et.parse(t)         town_root = town_tree.getroot()          print (town_root)          namespaces = {'ns': gen_ns(town_root.tag)}         print (namespaces)          day in town_root.iterfind('ns:day', namespaces):             date = (day.get('date'))             print (date)             day_temp = day.find('.//*[@type="day_short"]/temperature')               print (day_temp.text)

getting:

traceback (most recent call last): file "weather.py", line 154, in <module>     print (day_temp.text) attributeerror: 'nonetype' object has no attribute 'text'

what's wrong xpath? can attr of ('.//*[@type="day_short"]'), can't child (temperature) text everyone!

the xml document contains default namespace, , xpath has no concept of default namespace. in xpath, either need map prefix (like did day) or use other methods local-name determine if element's tag name matches want.

.//*[@type="day_short"]/*[local-name()='temperature']

or 

day_temp = day.find('.//*[@type="day_short"]/ns:temperature', namespaces)

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