code: def create_app_from_yml(path):
      
  
      try:
          with open(path, "rt", encoding="UTF-8") as f:
              try:
                  # Substitute ALL occurrences of '%(here)s' with a path to a
                  # directory with '.holocron.yml'. Please note, we also want
                  # wrap the result into 'io.StringIO' in order to preserve
                  # original filename in 'yaml.safe_load()' errors.
                  interpolated = io.StringIO(f.read() % {
                      "here": os.path.abspath(os.path.dirname(path))})
                  interpolated.name = f.name
  
                  conf = yaml.safe_load(interpolated)
              except yaml.YAMLError as exc:
                  raise RuntimeError(
                      "Cannot parse a configuration file. Context: " + str(exc))
  
      except FileNotFoundError:
          conf = {"metadata": None, "pipes": {}}
  
      return core.create_app(conf["metadata"], pipes=conf["pipes"])
docs: Return an application instance created from YAML.