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# chromosome.py

# From Classic Computer Science Problems in Python Chapter 5

# 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 TypeVar, Tuple, Type

from abc import ABC, abstractmethod

T = TypeVar('T', bound='Chromosome') # for returning self

# Base class for all chromosomes; all methods must be overridden

class Chromosome(ABC):

@abstractmethod

def fitness(self) -> float:

...

@classmethod

@abstractmethod

def random_instance(cls: Type[T]) -> T:

...

@abstractmethod

def crossover(self: T, other: T) -> Tuple[T, T]:

...

@abstractmethod

def mutate(self) -> None:

...