Improve input parsing

puzzles/1.py

@@ -7,7 +7,7 @@ test_input = """
 1   3
 3   9
 3   3
-""".strip()
+"""
 
 test_solution_p1 = 11
 test_solution_p2 = 31
@@ -28,6 +28,6 @@ def solve_p2(puzzle_input: str) -> int:
 
 
 def _parse_lists(puzzle_input: str) -> tuple[list[int], list[int]]:
-    lines = (line.partition("   ") for line in puzzle_input.split("\n") if line)
+    lines = (line.partition("   ") for line in puzzle_input.strip().split("\n"))
     list1, list2 = zip(*((int(line[0]), int(line[2])) for line in lines))
     return list1, list2