code: def find_server():
      
  
      if os.environ.has_key(_server_env):
          host = os.environ[_server_env]
          port = None
          if re.search(':', host):
              host, port = host.split(':', 1)
              if port:
                  port = int(port)
          return host, port
      else:
          raise RuntimeError("Environment variable %s is not set" % _server_env)
docs: Find the default server host from the environment
  
      This method uses the C{LIGO_DATAFIND_SERVER} variable to construct
      a C{(host, port)} tuple.
  
      @returns: C{(host, port)}: the L{str} host name and L{int} port number
  
      @raises RuntimeError: if the C{LIGO_DATAFIND_SERVER} environment variable
                            is not set