# Other Functions and Variables

This page lists and documents various miscellaneous functions and variables not better listed somewhere else.

## Ren'Py Version

renpy.version_string

  The version number of Ren'Py, as a string of the form "Ren'Py 1.2.3.456".

renpy.version_only

  The version number of Ren'Py, without the Ren'Py prefix. A string of the form "1.2.3.456".

renpy.version_tuple

  The version number of Ren'Py, as a tuple of the form (1, 2, 3, 456).

  This is a namedtuple with four fields: `major`, `minor`, `patch`, and `commit`.

renpy.version_name

  A human readable version name, of the form "Example Version."

renpy.license

  A string giving license text that should be included in a game's about screen.

## Platform Detection

Ren'Py includes a number of variables that are set based on which platform it's running on.

renpy.windows

  Has a true value when running on Windows.

renpy.macintosh

  Has a true value when running on macOS.

renpy.linux

  Has a true value when running on Linux or other POSIX-like operating systems.

renpy.android

  Has a true value when running on Android.

renpy.ios

  Has a true value when running on iOS.

renpy.emscripten

  Has a true value when running in the browser.

renpy.mobile

  Has a true value when running on Android or iOS or in the browser.

These are only set when running on the actual devices, not when running on in the emulators. These are more intended for use in platform-specific Python. For display layout, use screen variants.

## Memory Profiling

## renpy.random

This object is a random number generator that implements the Python random number generation interface. Randomness can be generated by calling the various methods this object exposes. See the Python documentation for the full list, but the most useful are:

- `renpy.random.random()`

Return the next random floating point number in the range (0.0, 1.0).

- `renpy.random.randint(a, b)`

Return a random integer such that a <= N <= b.

- `renpy.random.choice(seq)`

Return a random element from the non-empty sequence seq.

- `renpy.random.shuffle(seq)`

Shuffles the elements of the sequence seq in place. This does not return a list, but changes an existing one.

Unlike the standard Python random number generator, this object cooperates with rollback, generating the same numbers regardless of how many times we rollback. It should be used instead of the standard Python random module.

    # return a random float between 0 and 1
    $ randfloat = renpy.random.random()

    # return a random integer between 1 and 20
    $ d20roll = renpy.random.randint(1, 20)

    # return a random element from a list
    $ randfruit = renpy.random.choice(['apple', 'orange', 'plum'])

- `renpy.random.Random(seed=None)`

Returns a new random number generator object separate from the main one, seeded with the specified value if provided.

## SDL

These functions let you use the Python ctypes module to call functions in the SDL dll. There are no guarantees as to the version of SDL2 that's included with Ren'Py, including which features will or will not be compiled in. These functions may fail on platforms that can otherwise run Ren'Py, and so it's important to check for None before proceeding.

    init python:

        import ctypes

        def get_window_position():
            """
            Retrieves the position of the window from SDL2.  Returns
            the (x, y) of the upper left corner of the window, or
            (0, 0) if it's not known.
            """

            sdl = renpy.get_sdl_dll()

            if sdl is None:
                return (0, 0)

            win = renpy.get_sdl_window_pointer()

            if win is None:
                return (0, 0)

            SDL_GetWindowPosition = sdl.SDL_GetWindowPosition

            x = ctypes.c_int()
            y = ctypes.c_int()

            SDL_GetWindowPosition(win, ctypes.byref(x), ctypes.byref(y))

## Miscellaneous