# -*- coding: utf-8 -*- ?
import requests
import json
import sys
import codecs

def GetJSON(word):
  url = "https://ru.wiktionary.org//w/api.php?action=query&titles=%s&prop=revisions&rvprop=content&format=json"
  url = url%word
  answ = requests.get(url).content
  data = json.loads(answ)
  str = json.dumps(data, ensure_ascii=False, indent=4)
  return json.loads(str)

outfile = codecs.open("filename", 'w', "utf-8")
str = json.dumps(GetJSON("кот"), ensure_ascii=False, indent=4)
outfile.write(str)
outfile.close()

print GetJSON("кот")["query"]["pages"]["12766"]["title"]