class_docstr: Creates a very simple dropdown listing choices from which entries can be selected.
  Preprocessing: Preprocessing: passes the value of the selected dropdown entry as a {str}.
  Postprocessing: expects a {str} corresponding to the value of the dropdown entry to be selected.
  Examples-format: a {str} representing the drop down value to select.
  Demos: sentence_builder, titanic_survival
docstr: Parameters:
      x: selected choice
  Returns:
      selected choice
docstr_tok: ["Parameters",":","x",":","selected","choice","Returns",":","selected","choice"]
code: def preprocess(
      self, x: str | int | float | None
  ) -> str | int | float | None:
      """
      Parameters:
          x: selected choice
      Returns:
          selected choice
      """
      return x
  
file_path: gradio/gradio/_simple_templates/simpledropdown.py
imports: from __future__ import annotations
  import warnings
  from typing import Any, Callable
  from gradio.components.base import FormComponent
  from gradio.events import Events
label_desc: Use image node_id 4 for calling the SimpleDropdown obj's underlying member method code with example usage: obj.preprocess(x) and returns: x