The mypy static type checker always complain about using a dictionary to call functions. Especially this code segment from my chess program that I’m writing in Python as a learning exercise.

status = {Bishop: self.validate_move_bishop,
          King: self.validate_move_king,
          Knight: self.validate_move_knight,
          Pawn: self.validate_move_pawn,
          Queen: self.validate_move_queen,
          Rook: self.validate_move_rook,
         }.get(type(self._board[start]))(start, end)

This message, error: “None” not callable, always leave me cross-eyed at times. I came up with a solution for that problem.

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