text: #!/usr/bin/env python
  import nbformat
  from nbconvert.preprocessors import ExecutePreprocessor
  from nbformat.notebooknode import NotebookNode
  
  
  def nbexec(in_file: str, kernel: str = "python3") -> NotebookNode:
      """Create an executed notebook without modifying the input notebook.
  
      :param in_file: The name of the Jupyter notebook file to be executed.
      :param kernel: The programming language used to execute the notebook.
      :return: An executed ``nbformat.NotebookNode`` object.
      """
      nb = nbformat.read(in_file, as_version=4)
      ep = ExecutePreprocessor(timeout=600, kernel_name=kernel)
      ep.preprocess(nb, {"metadata": {"path": "."}})
      return nb
  