code: def expand_docstring(**kwargs):
      """Decorator to programmatically expand the docstring.
  
      Args:
        **kwargs: Keyword arguments to set. For each key-value pair `k` and `v`,
          the key is found as `${k}` in the docstring and replaced with `v`.
  
      Returns:
        Decorated function.
      """
  
      def _fn_wrapped(fn):
          """Original function with modified `__doc__` attribute."""
          doc = inspect.cleandoc(fn.__doc__)
          for k, v in six.iteritems(kwargs):
              # Capture each ${k} reference to replace with v.
              # We wrap the replacement in a function so no backslash escapes
              # are processed.
              pattern = r"\$\{" + str(k) + r"\}"
              doc = re.sub(
                  pattern, lambda match: v, doc
              )  # pylint: disable=cell-var-from-loop
          fn.__doc__ = doc
          return fn
  
      return _fn_wrapped
  
label_desc: Use image node_id 1 for calling a global function with example usage: expand_docstring() and returns: _fn_wrapped, fn