class_docstr: A pointer to a delta location in the app.
  
  When adding an element to the app, you should always call
  get_locked_cursor() on that element's respective Cursor.
class_docstr_tok: ["A","pointer","to","a","delta","location","in","the","app",".","When","adding","an","element","to","the","app",",","you","should","always","call","get_locked_cursor","(",")","on","that","element","'s","respective","Cursor","."]
docstr: The index of the Delta within its parent block.
docstr_tok: ["The","index","of","the","Delta","within","its","parent","block","."]
code: def index(self) -> int:
      """The index of the Delta within its parent block."""
      raise NotImplementedError()
  
imports: from typing import Any, List, Optional, Tuple
  from streamlit import util
  from streamlit.runtime.scriptrunner import get_script_run_ctx
label_desc: Use image node_id 4 for calling the Cursor obj's underlying member method code with example usage: obj.index() without return types