Парсинг: получить все термины с сайта

# –*coding:utf-8 *–
from lxml.html import parse
from urllib.request import urlopen
from urllib.parse import urljoin
 
from lxml.html import fromstring
 
 
URL = 'http://www.ekonomiks.net.ua/'
ITEM_PATH = '.letters'
DESCR_PATH = '.container .content'
def parse_let():
    f=urlopen(URL)
    list_html = f.read().decode('utf-8')
    list_doc = fromstring(list_html)
    
    for div in list_doc.cssselect(ITEM_PATH):
        for elem in div:
            a = elem.cssselect('a')[0]
            
            href = a.get('href')
            url = urljoin(URL, href)
            details_html = parse(url).getroot()
            for descr_elem in details_html.cssselect(DESCR_PATH):
                a2 = descr_elem.cssselect('a')[0]
                name = a2.text
                print(name)

a2 = descr_elem.cssselect('a')[0]
name = a2.text
print(name)

for a_el in descr_elem.cssselect('a'):
    name = a_el.text
    print(name)

# –*coding:utf-8 *–
from lxml.html import parse
from urllib.request import urlopen
from urllib.parse import urljoin
from lxml.html import fromstring
 
 
URL = 'http://www.ekonomiks.net.ua/'
ITEM_PATH = '.letters'
DESCR_PATH = '.container .content'
def parse_let():
    f=urlopen(URL)
    list_html = f.read().decode('utf-8')
    list_doc = fromstring(list_html)
    term=[]
    for div in list_doc.cssselect(ITEM_PATH):
        for elem in div:
            a = elem.cssselect('a')[0]
            
            href = a.get('href')
            url = urljoin(URL, href)
            details_html = parse(url).getroot()
            for descr_elem in details_html.cssselect(DESCR_PATH):
                for a_el in descr_elem.cssselect('a'):
                    name = a_el.text
                    term.append(name)
    return (term)              
                
 
def export(filename, term):
    filename = open('term.txt', 'w+')
    for word in term:
        filename.write(word)
    filename.close
    return (export)
    
 
            
def main():
    term = parse_let()
    export('term.txt', term)

UnicodeEncodeError: 'charmap' codec can't encode characters in position 10-11: character maps to <undefined>

filename.write(word + '\n')

Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    main()
  File "D:\test.py", line 41, in main
    export('term.txt', term)
  File "D:\test.py", line 33, in export
    filename.write(word + '\n')
  File "C:\Python34\lib\encodings\cp1251.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode characters in position 10-11: character maps to <undefined>

filename = open('term.txt', 'w+', encoding='utf8')