code: def add_code_cell(self, content, tags=None):
          
          self.notebook["cells"].append(nb.v4.new_code_cell(content, **{"metadata":
                                                                        {"tags": tags}}))
docs: Class method responsible for adding a code cell with content 'content' to the
          Notebook object.
  
          ----------
          Parameters
          ----------
          content : str
              Code in a string format to include in the cell (triple quote for multiline
              text).
  
          tags : list
              A list of tags to include in the code cell metadata.