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# board.py

# From Classic Computer Science Problems in Python Chapter 8

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

from __future__ import annotations

from typing import NewType, List

from abc import ABC, abstractmethod

Move = NewType('Move', int)

class Piece:

@property

def opposite(self) -> Piece:

raise NotImplementedError("Should be implemented by subclasses.")

class Board(ABC):

@property

@abstractmethod

def turn(self) -> Piece:

...

@abstractmethod

def move(self, location: Move) -> Board:

...

@property

@abstractmethod

def legal_moves(self) -> List[Move]:

...

@property

@abstractmethod

def is_win(self) -> bool:

...

@property

def is_draw(self) -> bool:

return (not self.is_win) and (len(self.legal_moves) == 0)

@abstractmethod

def evaluate(self, player: Piece) -> float:

...