how to get jupyter notebook cells by tag?

[Krishna Bhogaonker]

Hello folks. So I have created tags for certain notebook cells in a standard Jupyter 6.2.1 notebook. Then I have a widget button, which when pushed will only execute cells with a certain tag. I want to run these cells in python, since the widgets themselves are just standard python notebook widgets. 

I have been looking through posts and github issues, etc., to see if there is a way to extract cell indices by tag, but have not found any documentation on this. Seems like there are some references to a "Jupyter.notebook.get_selected_cells()" function and a "Jupyter.notebook.get_cells()" function, but I have not found any documentation on either of these functions. Of course I might be looking

in the wrong place, etc.

Can anyone tell me what the function is to get all cells with a certain tag, or to lookup cells by text within the cell, etc. Even a link to the documentation would help.

[Travis DePrato]

In JavaScript (assuming the classic notebook, rather than JupyterLab), you could do this:

function findCellsByTag(tagName) {
  return Jupyter.notebook.get_cells().filter(function(cell) {
    // check that tags is defined and contains desired tag
    return cell.metadata.tags && cell.metadata.tags.includes(tagName)
  });
}

or, with more concise arrow and object destructuring syntax,

function findCellsByTag(tagName) {
  return Jupyter.notebook.get_cells().filter(
    ({metadata: {tags}}) => tags && tags.includes(tagName)
  );
}

To find indices:

function findCellIndicesByTag(tagName) {
  return (Jupyter.notebook.get_cells()
    .filter(
      ({metadata: {tags}}) => tags && tags.includes(tagName)
    )
    .map((cell) => Jupyter.notebook.find_cell_index(cell))
  );
}

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Travis DePrato (he/him/his, they/them/theirs)

University of Michigan, Ann Arbor

Computer Science & Engineering

Mathematics (Discrete and Algorithmic Methods)