some formatting fixes

Author: davecom

Chapter2/dna_search.py

@@ -19,7 +19,7 @@ def string_to_gene(s: str) -> Gene:
     return gene
 
 
-my_gene = string_to_gene(gene_str)
+my_gene: Gene = string_to_gene(gene_str)
 
 
 def linear_contains(gene: Gene, key_codon: Codon) -> bool:

Chapter2/generic_search.py

@@ -150,8 +150,6 @@ def bfs(initial: T, goal_test: Callable[[T], bool], successors: Callable[[T], Li
     return None  # went through everything and never found goal
 
 
-# Upon each pop() returns the item with the highest lowest priority
-# unless max is set to true
 class PriorityQueue(Generic[T]):
     def __init__(self) -> None:
         self._container: List[T] = []

Chapter2/missionaries.py

@@ -55,6 +55,7 @@ def successors(self) -> List["MCState"]:
                 sucs.append(MCState(self.wm + 1, self.wc + 1, not self.boat))
         return [x for x in sucs if x.is_legal]
 
+
 def display_solution(path: List[MCState]):
     if len(path) == 0: # sanity check
         return
@@ -70,6 +71,7 @@ def display_solution(path: List[MCState]):
         print(current_state)
         old_state = current_state
 
+
 if __name__ == "__main__":
     start: MCState = MCState(3, 3, True)
     solution: Optional[Node[MCState]] = bfs(start, MCState.goal_test, MCState.successors)