#### 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, args: \p{print frame-arguments}")

  will return the string:

      "frame: main, args: scalars"