class_docstr: Retrieve output from a notebook file with tagged cells.
  
  For instructions on tagging cells,
  `see this <https://papermill.readthedocs.io/en/latest/usage-parameterize.html>`_.
  
  Notes
  -----
  Ignores untagged cells, if a cell has more than one tag, it uses the first
  one as identifier. If a cell has more than one output, it uses the last
  one and discards the rest.
class_docstr_tok: ["Retrieve","output","from","a","notebook","file","with","tagged","cells",".","For","instructions","on","tagging","cells",",","`","see","this","<","https",":","\/\/papermill.readthedocs.io\/en\/latest\/usage-parameterize.html",">","`","_",".","Notes","--","--","-","Ignores","untagged","cells",",","if","a","cell","has","more","than","one","tag",",","it","uses","the","first","one","as","identifier",".","If","a","cell","has","more","than","one","output",",","it","uses","the","last","one","and","discards","the","rest","."]
code: def __iter__(self):
      for k in self.tag2output:
          yield k
  
imports: import base64
  from collections.abc import Mapping
  import ast
  import parso
  import pandas
  import nbformat
  from IPython.display import Image, HTML
label_desc: Use image node_id 4 for calling the NotebookIntrospector obj's underlying member method code with example usage: obj.__iter__() without return types