# Statement Equivalents

To allow Ren'Py to be scripted in Python, each Ren'Py statement has a Python equivalent. This usually consists of a Python function, but may also consist of a pattern of Python calls that perform an action equivalent to the statement.

## Dialogue

The Ren'Py say statement is equivalent to calling the character object as a function. The following displays the same line twice:

    e "Hello, world."

    $ e("Hello, world.")

Displaying narration can be done the same way, by using the `narrator` character. When calling a character, it's possible to supply the keyword argument `interact`. When `interact` is False, Ren'Py will display the character dialogue box, and will then return before performing an interaction.

This equivalence of characters and function objects works in the other direction as well. It is possible to declare a Python function, and then use that function in the place of a character object. For example, the following function uses a variable to choose between two characters.

    define lucy_normal = Character("Lucy")
    define lucy_evil = Character("Evil Lucy")

    init python:

        def l(what, **kwargs):
            if lucy_is_evil:
                lucy_evil(what, **kwargs)
            else:
                lucy_normal(what, **kwargs)

    label start:

        $ lucy_is_evil = False

        l "Usually, I feel quite normal."

        $ lucy_is_evil = True

        l "But sometimes, I get really mad!"

A function used in this way should either ignore unknown keyword arguments, or pass them to a character function. Doing this will allow the game to continue working if Ren'Py adds additional keyword arguments to character calls.

`renpy.``say`(who, what, *args, **kwargs)

  The equivalent of the say statement.

  who
    Either the character that will say something, None for the narrator, or a string giving the character name. In the latter case, the `say()` is used to create the speaking character.
  what
    A string giving the line to say. Percent-substitutions are performed in this string.
  interact
    If true, Ren'Py waits for player input when displaying the dialogue. If false, Ren'Py shows the dialogue, but does not perform an interaction. (This is passed in as a keyword argument.)

  This function is rarely necessary, as the following three lines are equivalent.

      e "Hello, world."
      $ renpy.say(e, "Hello, world.")
      $ e("Hello, world.")

## Choice Menus

The menu statement has an equivalent Python function.

`renpy.``display_menu`(items, interact=True, screen="choice")

  This displays a menu to the user. items should be a list of 2-item tuples. In each tuple, the first item is a textual label, and the second item is the value to be returned if that item is selected. If the value is None, the first item is used as a menu caption.

  This function takes many arguments, of which only a few are documented. Except for items, all arguments should be given as keyword arguments.

  interact
    If false, the menu is displayed, but no interaction is performed.
  screen
    The name of the screen used to display the menu.

  Note that most Ren'Py games do not use menu captions, but use narration instead. To display a menu using narration, write:

      $ narrator("Which direction would you like to go?", interact=False)
      $ result = renpy.display_menu([ ("East", "east"), ("West", "west") ])

## Displaying Images

The image, scene, show, and hide statements each have an equivalent Python function.

`renpy.``get_at_list`(name, layer=None, camera=False)

  Returns the list of transforms being applied to the image with tag name on layer. Returns an empty list if no transforms are being applied, or None if the image is not shown.

  If layer is None, uses the default layer for the given tag.

`renpy.``hide`(name, layer=None)

  Hides an image from a layer. The Python equivalent of the hide statement.

  name
    The name of the image to hide. Only the image tag is used, and any image with the tag is hidden (the precise name does not matter).
  layer
    The layer on which this function operates. If None, uses the default layer associated with the tag.

`renpy.``image`(name, d)

  Defines an image. This function is the Python equivalent of the image statement.

  name
    The name of the image to display, a string.
  d
    The displayable to associate with that image name.

  This function may only be run from inside an init block. It is an error to run this function once the game has started.

`renpy.``scene`(layer=u'master')

  Removes all displayables from layer. This is equivalent to the scene statement, when the scene statement is not given an image to show.

  A full scene statement is equivalent to a call to renpy.scene followed by a call to `renpy.show()`. For example:

      scene bg beach

  is equivalent to:

      $ renpy.scene()
      $ renpy.show("bg beach")

`renpy.``show`(name, at_list=[], layer='master', what=None, zorder=0, tag=None, behind=[])

  Shows an image on a layer. This is the programmatic equivalent of the show statement.

  name
    The name of the image to show, a string.
  at_list
    A list of transforms that are applied to the image. The equivalent of the `at` property.
  layer
    A string, giving the name of the layer on which the image will be shown. The equivalent of the `onlayer` property. If None, uses the default layer associated with the tag.
  what
    If not None, this is a displayable that will be shown in lieu of looking on the image. (This is the equivalent of the show expression statement.) When a what parameter is given, name can be used to associate a tag with the image.
  zorder
    An integer, the equivalent of the `zorder` property. If None, the zorder is preserved if it exists, and is otherwise set to 0.
  tag
    A string, used to specify the image tag of the shown image. The equivalent of the `as` property.
  behind
    A list of strings, giving image tags that this image is shown behind. The equivalent of the `behind` property.

`renpy.``show_layer_at`(at_list, layer=u'master', reset=True, camera=False)

  The Python equivalent of the `show layer` layer `at` at_list statement. If camera is True, the equivalent of the `camera` statement.

  reset
    If true, the transform state is reset to the start when it is shown. If false, the transform state is persisted, allowing the new transform to update that state.

## Transitions

The equivalent of the with statement is the `renpy.with_statement()` function.

`renpy.``with_statement`(trans, always=False)

  Causes a transition to occur. This is the Python equivalent of the with statement.

  trans
    The transition.
  always
    If True, the transition will always occur, even if the user has disabled transitions.

  This function returns true if the user chose to interrupt the transition, and false otherwise.

## Jump

The equivalent of the jump statement is the `renpy.jump()` function.

`renpy.``jump`(label)

  Causes the current statement to end, and control to jump to the given label.

## Call

The equivalent of the call statement is the `renpy.call()` function.

`renpy.``call`(label, *args, **kwargs)

  Causes the current Ren'Py statement to terminate, and a jump to a label to occur. When the jump returns, control will be passed to the statement following the current statement.

  from_current
    If true, control will return to the current statement, rather than the statement following the current statement. (This will lead to the current statement being run twice. This must be passed as a keyword argument.)

`renpy.``return_statement`(value=None)

  Causes Ren'Py to return from the current Ren'Py-level call.