code: def fetch_uri(self, directory, uri):
          
          filename = os.path.basename(urlparse(uri)[2])
          if os.path.exists(filename):
              self.logger.error("ERROR: File exists: " + filename)
              return 1
  
          try:
              downloaded_filename, headers = urlretrieve(uri, filename)
              self.logger.info("Downloaded ./" + filename)
          except IOError as err_msg:
              self.logger.error("Error downloading package %s from URL %s"  \
                      % (filename, uri))
              self.logger.error(str(err_msg))
              return 1
  
          if headers.gettype() in ["text/html"]:
              dfile = open(downloaded_filename)
              if re.search("404 Not Found", "".join(dfile.readlines())):
                  dfile.close()
                  self.logger.error("'404 Not Found' error")
                  return 1
              dfile.close()
          return 0
docs: Use ``urllib.urlretrieve`` to download package to file in sandbox dir.
  
          @param directory: directory to download to
          @type directory: string
  
          @param uri: uri to download
          @type uri: string
  
          @returns: 0 = success or 1 for failed download