What on earth with the trees

aoc2020/day03/solution.py

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+import pprint
+import sys
+import typing
+
+
+class Loc(typing.NamedTuple):
+    x: int
+    y: int
+
+
+def main() -> int:
+    forest_frame = [list(line.strip()) for line in sys.stdin.readlines()]
+    frame_width = len(forest_frame[0])
+    frame_height = len(forest_frame)
+    loc = Loc(x=0, y=0)
+
+    trees_encountered = 0
+
+    while loc.y <= (frame_height - 1):
+        at_loc = forest_frame[loc.y][loc.x]
+        if at_loc == "#":
+            trees_encountered += 1
+
+        next_x = (loc.x + 3) % frame_width
+        next_y = loc.y + 1
+        next_loc = Loc(x=next_x, y=next_y)
+        loc = next_loc
+
+    print(f"trees encountered: {trees_encountered}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())