parameters: (self, row, col)
return_statement: return self.get_character(row, col) == WALL
docstring: (Maze, int, int) -> bool
  
  	Precondition: 0 <= row < len(maze)
  	Precondition: 0 <= col < len(maze[0])
  
          Return True if and only if there is a wall at the given row and column of the maze.
  
          >>> maze = Maze([['#', '#', '#', '#', '#', '#', '#'], \
                           ['#', '.', '.', '.', '.', '.', '#'], \
                           ['#', '.', '#', '#', '#', '.', '#'], \
                           ['#', '.', '.', '@', '#', '.', '#'], \
                           ['#', '@', '#', '.', '@', '.', '#'], \
                           ['#', '#', '#', '#', '#', '#', '#']], \
                          Rat('J', 1, 1), \
                          Rat('P', 1, 4))
          >>> maze.is_wall(0, 0)
          True
          >>> maze.is_wall(1, 1)
          False
          >>> maze.is_wall(1, 2)
          False
          >>> maze.is_wall(3, 3)
          False
docstring_summary: (Maze, int, int) -> bool
docstring_tokens: ( Maze int int ) - > bool
function: def is_wall(self, row, col):
          """ (Maze, int, int) -> bool
  
  	Precondition: 0 <= row < len(maze)
  	Precondition: 0 <= col < len(maze[0])
  
          Return True if and only if there is a wall at the given row and column of the maze.
  
          >>> maze = Maze([['#', '#', '#', '#', '#', '#', '#'], \
                           ['#', '.', '.', '.', '.', '.', '#'], \
                           ['#', '.', '#', '#', '#', '.', '#'], \
                           ['#', '.', '.', '@', '#', '.', '#'], \
                           ['#', '@', '#', '.', '@', '.', '#'], \
                           ['#', '#', '#', '#', '#', '#', '#']], \
                          Rat('J', 1, 1), \
                          Rat('P', 1, 4))
          >>> maze.is_wall(0, 0)
          True
          >>> maze.is_wall(1, 1)
          False
          >>> maze.is_wall(1, 2)
          False
          >>> maze.is_wall(3, 3)
          False
          """
  
          return self.get_character(row, col) == WALL
function_tokens: def is_wall ( self , row , col ) : return self . get_character ( row , col ) == WALL