added maze generator

maze.py

@@ -0,0 +1,75 @@
+import random
+from itertools import product
+from typing import Tuple, Set, Union, Any, List, NamedTuple
+from pprint import pprint
+
+
+class Cell(NamedTuple):
+    x: int
+    y: int
+
+
+class Wall(NamedTuple):
+    first_cell: Cell
+    second_cell: Cell
+
+
+class Maze:
+    def __init__(self, width: int, height: int):
+        self.cells = set(Cell(*c) for c in product(range(width), range(height)))
+        self.maze = dict()
+        for cell in self.cells:
+            self.maze[cell] = self.get_neighbours(cell)
+        self.walls = self.get_walls()
+        self.generate_maze()
+
+    def get_neighbours(self, cell: Cell) -> Set[Cell]:
+        diffs = ((0, 1), (0, -1), (1, 0), (-1, 0))
+        return set(Cell(cell.x + x, cell.y + y) for x, y in diffs if Cell(cell.x + x, cell.y + y) in self.cells)
+
+    def get_walls(self) -> Set[Wall]:
+        walls = set()
+        for cell in self.cells:
+            walls.update(set(Wall(*sorted([cell, c])) for c in self.maze[cell]))
+        return walls
+
+    def generate_maze(self) -> None:
+        visited = set()
+        unvisited = list(self.cells)
+        node = random.choice(unvisited)
+        visited.add(node)
+        unvisited.remove(node)
+        while unvisited:
+            random_neighbour = random.choice(list(self.maze[node]))
+            if random_neighbour not in visited:
+                self.walls.remove(Wall(*sorted([node, random_neighbour])))
+                visited.add(random_neighbour)
+                try:
+                    unvisited.remove(random_neighbour)
+                except ValueError:
+                    pass
+            node = random_neighbour
+
+    def generate_prim_maze(self) -> None:
+        visited = set()
+        node = random.choice(list(self.cells))
+        visited.add(node)
+        removed_walls = set()
+        wall_list = [w for w in self.walls if node in w]
+        while wall_list:
+            random_wall = random.choice(wall_list)
+            wall_list.remove(random_wall)
+            cell1, cell2 = random_wall
+            if (cell1 in visited) != (cell2 in visited):
+                removed_walls.add(random_wall)
+                self.walls.remove(random_wall)
+                visited.add(cell1)
+                visited.add(cell2)
+                wall_list.extend(
+                    set(w for w in self.walls if (cell1 in w) or (cell2 in w)).difference(removed_walls)
+                )
+
+
+if __name__ == "__main__":
+    maze = Maze(3, 3)
+    pprint(maze.walls)