##### 23.2.4.3 gdb.prompt

This module provides a method for prompt value-substitution.

`substitute_prompt (`string`)`
  Return string with escape sequences substituted by values. Some escape sequences take arguments. You can specify arguments inside “{}” immediately following the escape sequence.

  The escape sequences you can pass to this function are:

  `\\`
    Substitute a backslash.
  `\e`
    Substitute an ESC character.
  `\f`
    Substitute the selected frame; an argument names a frame parameter.
  `\n`
    Substitute a newline.
  `\p`
    Substitute a parameter's value; the argument names the parameter.
  `\r`
    Substitute a carriage return.
  `\t`
    Substitute the selected thread; an argument names a thread parameter.
  `\v`
    Substitute the version of GDB.
  `\w`
    Substitute the current working directory.
  `\[`
    Begin a sequence of non-printing characters. These sequences are typically used with the ESC character, and are not counted in the string length. Example: “\[\e[0;34m\](gdb)\[\e[0m\]” will return a blue-colored “(gdb)” prompt where the length is five.
  `\]`
    End a sequence of non-printing characters.

  For example:

                substitute_prompt (``frame: \f,
                                   print arguments: \p{print frame-arguments}'')

  will return the string:

                "frame: main, print arguments: scalars"