code: def find_default(self, filename):
          
          for path in self.DEFAULT_PATH:
              # Normalize path
              path = os.path.expanduser(os.path.expandvars(path))
              fullname = os.path.realpath(os.path.join(path, filename))
  
              if os.path.exists(fullname) and os.path.isfile(fullname):
                  yield fullname
docs: A generate which looks in common folders for the default configuration
          file. The paths goes from system defaults to user specific files.
  
          :param filename: The name of the file to find
          :return: The complete path to the found files