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The Tile Interface
==================
Module name
-----------
Your tile will have a module name such as ``weatbag.tiles.s3e11``, which
determines its position on the grid. The co-ordinates use compass directions: n/s
followed by e/w. If one co-ordinate is 0, it should be left out. So the tiles
around the centre are named:
+------+------+-------+------+------+
| n2w2 | n2w1 | n2 | n2e1 | n2e2 |
+------+------+-------+------+------+
| n1w2 | n1w1 | n1 | n1e1 | n1e2 |
+------+------+-------+------+------+
| w2 | w1 | centre| e1 | e2 |
+------+------+-------+------+------+
| s1w2 | s1w1 | s1 | s1e1 | s1e2 |
+------+------+-------+------+------+
| s2w2 | s2w1 | s2 | s2e1 | s2e2 |
+------+------+-------+------+------+
The Tile class
--------------
Your module should define a class called ``Tile``, with the following interface:
.. class:: Tile()
.. method:: describe()
Describe the scene and anything in it. This is called when the player
enters the tile, and again if they look around.
.. method:: action(player, do)
Called when the player does something inside the tile. You need to
interpret the action and carry it out.
:param player: the active :class:`~weatbag.Player` instance
:param action: list of strings - the player's input, split up into words,
lowercase and with prepositions removed
.. method:: leave(player, direction)
*Optional.* Called when the player tries to leave the square. To let them
leave, return `True`, or to prevent them, print an explanation and return
`False`. If the method isn't found, the player can always leave.
:param player: the active :class:`~weatbag.Player` instance
:param direction: the direction the player is trying to leave, as a single
lowercase character, n/e/s/w
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