text: import requests
  from . import FeedSource, _request_headers
  
  # pylint: disable=no-member
  class WorldCoinIndex(FeedSource):  # Weighted average from WorldCoinIndex 
      def __init__(self, *args, **kwargs):
          super().__init__(*args, **kwargs)
          self.timeout = getattr(self, 'timeout', 15)
          if not hasattr(self, 'api_key'):
              raise Exception("WorldCoinIndex FeedSource requires 'api_key'.")
  
      def _fetch(self):
          feed = {}
          for base in self.bases:
              url = "https://www.worldcoinindex.com/apiservice/v2getmarkets?key={apikey}&fiat={base}"
              response = requests.get(url=url.format(apikey=self.api_key, base=base),
                                      headers=_request_headers, timeout=self.timeout)
              result = response.json()['Markets']
              for market in result:
                  for ticker in market:
                      (quote, returnedBase) = ticker['Label'].split('/')
                      if base == returnedBase and quote in self.quotes:
                          self.add_rate(feed, base, quote, ticker['Price'], ticker['Volume_24h'])
          return feed
  