Issues when running Python Script

> import csv
import time

import requests
from bs4 import BeautifulSoup


def get_val(tag, term):
     try:
    val = tag.find(term)['value'].encode('ascii', 'ignore')
except:
    val = 'NaN'
return val


base = 'http://ift.tt/2qUi5RD'
with open('ids.txt') as f:
ids = [line.strip() for line in f.readlines()]
split = 30
f = open('games.csv', 'w')
writer = csv.writer(f)
writer.writerow(('id', 'type', 'name', 'yearpublished', 'minplayers', 
'maxplayers', 'playingtime',
             'minplaytime', 'maxplaytime', 'minage', 'users_rated', 
'average_rating',
             'bayes_average_rating', 'total_owners', 'total_traders', 'total_wanters',
               'total_wishers', 'total_comments', 'total_weights', 
'average_weight', 'Description'))
for i in range(0, len(ids), split):
url = base.format(','.join(ids[i:i+split]))
print('Requesting {}'.format(url))
req = requests.get(url)
soup = BeautifulSoup(req.content, 'xml')
items = soup.find_all('item')
for item in items:
    gid = item['id']
    gtype = item['type']
    gname = get_val(item, 'name')
    gyear = get_val(item, 'yearpublished')
    gmin = get_val(item, 'minplayers')
    gmax = get_val(item, 'maxplayers')
    gplay = get_val(item, 'playingtime')
    gminplay = get_val(item, 'minplaytime')
    gmaxplay = get_val(item, 'maxplaytime')
    gminage = get_val(item, 'minage')
    usersrated = get_val(item.statistics.ratings, 'usersrated')
    avg = get_val(item.statistics.ratings, 'average')
    bayesavg = get_val(item.statistics.ratings, 'bayesaverage')
    owners = get_val(item.statistics.ratings, 'owned')
    traders = get_val(item.statistics.ratings, 'trading')
    wanters = get_val(item.statistics.ratings, 'wanting')
    wishers = get_val(item.statistics.ratings, 'wishing')
    numcomments = get_val(item.statistics.ratings, 'numcomments')
    numweights = get_val(item.statistics.ratings, 'numweights')
    avgweight = get_val(item.statistics.ratings, 'averageweight')
    desc = get_val(item.Description, 'Description')
    # desc = get_val Description.text.encode)
    writer.writerow((gid, gtype, gname, gyear, gmin, gmax, gplay, gminplay, gmaxplay, gminage,
                     usersrated, avg, bayesavg, owners, traders, wanters, wishers, numcomments,
                     numweights, avgweight, Description))
time.sleep(2)

f.close()

so I have a code that I have done but im now stuck i try to run the code to scrap item descriptions from boardgamegeeks but i am facing this error

python get_game_info.py

File "get_game_info.py", line 53 desc = get_val(item.Description, 'Description')