def _new_request():
 if (RESERVED_MARKER in os.environ):
  return False
 os.environ[RESERVED_MARKER] = RESERVED_MARKER
 return True

def _new_request ( ) : if ( RESERVED_MARKER in os . environ ) : return False os . environ [ RESERVED_MARKER ] = RESERVED_MARKER return True
test if this is the first call to this function in the current request .