add day two part two

day2/password_philosophy.py

@@ -64,9 +64,14 @@ def parse_policy(input_string: str) -> Dict[str, int]:
     }
 
 
-def verify_password(policy, password) -> bool:
-    counter = Counter(password)
-    return policy['lower_bound'] <= counter[policy['char']] <= policy['upper_bound']
+def verify_password(policy, password, part_two_rules: bool = True) -> bool:
+    if not part_two_rules:
+        counter = Counter(password)
+        return policy['lower_bound'] <= counter[policy['char']] <= policy['upper_bound']
+    else:
+        lb, ub = policy['lower_bound'], policy['upper_bound']
+        # 1 indexed, ^ == XOR
+        return (password[lb - 1] == policy['char']) ^ (password[ub - 1] == policy['char'])
 
 
 def count_valid_passwords(parsed_passwords: List[Tuple[Dict, str]]):