class_docstr: Format selected text (region).
class_docstr_tok: ["Format","selected","text","(","region",")","."]
docstr: Return value for tab width.
docstr_tok: ["Return","value","for","tab","width","."]
code: def _asktabwidth(self):
      "Return value for tab width."
      return askinteger(
          "Tab width",
          "Columns per tab? (2-16)",
          parent=self.editwin.text,
          initialvalue=self.editwin.indentwidth,
          minvalue=2,
          maxvalue=16,
      )
  
imports: import re
  from tkinter.messagebox import askyesno
  from tkinter.simpledialog import askinteger
  from idlelib.config import idleConf
label_desc: Use image node_id 10 for calling the FormatRegion obj's underlying member method code with example usage: obj._asktabwidth() and returns: askinteger