prompt.
:param default: the default value to use if no input happens.  If this
                is not given it will prompt until it's aborted.
:param hide_input: if this is set to true then the input value will
                   be hidden.
:param confirmation_prompt: Prompt a second time to confirm the
    value. Can be set to a string instead of ``True`` to customize
    the message.
:param type: the type to use to check the value against.
:param value_proc: if this parameter is provided it's a function that
                   is invoked instead of the type conversion to
                   convert a value.
:param prompt_suffix: a suffix that should be added to the prompt.
:param show_default: shows or hides the default value in the prompt.
:param err: if set to true the file defaults to ``stderr`` instead of
            ``stdout``, the same as with echo.
:param show_choices: Show or hide choices if the passed type is a Choice.
                     For example if type is a Choice of either day or week,
                     show_choices is true and text is "Group by" then the
                     prompt will be "Group by (day, week): ".

.. versionadded:: 8.0
    ``confirmation_prompt`` can be a custom string.

.. versionadded:: 7.0
    Added the ``show_choices`` parameter.

.. versionadded:: 6.0
    Added unicode support for cmd.exe on Windows.

.. versionadded:: 4.0
    Added the `err` parameter.

c