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Fix mypy errors by SSteve · Pull Request #3 · davecom/ClassicComputerScienceProblemsInPython · GitHub

/ ClassicComputerScienceProblemsInPython Public

Fix mypy errors #3

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Fix mypy errors #3

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6 changes: 3 additions & 3 deletions Chapter5/genetic_algorithm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -38,11 +38,11 @@ def __init__(self, initial_population: List[C], threshold: float, max_generation

# Use the probability distribution wheel to pick 2 parents
# Note: will not work with negative fitness results
def _pick_roulette(self, wheel: List[float]) -> Tuple[C, C]:
def _pick_roulette(self, wheel: List[float]) -> Tuple[C, ...]:
return tuple(choices(self._population, weights=wheel, k=2))

# Choose num_participants at random and take the best 2
def _pick_tournament(self, num_participants: int) -> Tuple[C, C]:
def _pick_tournament(self, num_participants: int) -> Tuple[C, ...]:
participants: List[C] = choices(self._population, k=num_participants)
return tuple(nlargest(2, participants, key=self._fitness_key))

Expand All @@ -53,7 +53,7 @@ def _reproduce_and_replace(self) -> None:
while len(new_population) < len(self._population):
# pick the 2 parents
if self._selection_type == GeneticAlgorithm.SelectionType.ROULETTE:
parents: Tuple[C, C] = self._pick_roulette([x.fitness() for x in self._population])
parents: Tuple[C, ...] = self._pick_roulette([x.fitness() for x in self._population])
else:
parents = self._pick_tournament(len(self._population) // 2)
# potentially crossover the 2 parents
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