def __init__(self, maze, mode):
"""
Inputs:
maze: a MazeClass.Maze instance
mode: one of "BFS", "DFS", or "RND"
"""
self.mz = maze #just made a new, shorter name.
self.free = {}
self.parents = {}
self.walls = {}
self.start = maze.start
self.end = maze.goal
if mode == "DFS":
self.frontier = LIFO_Queue()
elif mode == "BFS":
self.frontier = FIFO_Queue()
elif mode == "RND":
self.frontier = Random_Queue()
