some clean ups

day_06/program.py

@@ -17,37 +17,50 @@ def get_lab(lines: list) -> tuple:
             if cell_content == "^":
                 g_row, g_col = row_num, col_num
                 row.append('.')
-            else: row.append(cell_content)
+            else:
+                row.append(cell_content)
         lab.append(row)
     return lab, g_row, g_col
 
+
+def next_position(row: int, col: int, direction: int) -> tuple:
+    deltas = [(-1, 0), (0, 1), (1, 0), (0, -1)]
+    delta_row, delta_col = deltas[direction]
+    new_row = row + delta_row
+    new_col = col + delta_col
+    return new_row, new_col
+
+
+def pos_invalid(row, col, max_row, max_col) -> bool:
+    if 0 <= row <= max_row and 0 <= col <= max_col:
+        return False
+    return True
+
+
 def get_visits(lab: list, g_row: int, g_col: int) -> int:
     visits = {}
-    directions = [(-1, 0), (0, 1), (1, 0), (0, -1)]
     g_dir = 0
+    max_row = len(lab) - 1
+    max_col = len(lab[0]) - 1
     while True:
+        new_row, new_col = next_position(g_row, g_col, g_dir)
         visits[g_row, g_col] = True
-        delta_row, delta_col = directions[g_dir]
-        new_row = g_row + delta_row
-        new_col = g_col + delta_col
-        # print(new_row, new_col)
-        if new_row < 0 or new_row >= len(lab) or new_col < 0 or new_col >= len(lab[0]):
+        if pos_invalid(new_row, new_col, max_row, max_col):
             return len(visits)
         elif lab[new_row][new_col] == "#":
-            g_dir += 1
-            if g_dir >= len(directions):
-                g_dir = 0
+            g_dir = (g_dir + 1) % 4
         else:
             g_row = new_row
             g_col = new_col
 
+
 def main():
     # lines = get_lines("sample-input.txt")
     lines = get_lines("input.txt")
     lab, g_row, g_col = get_lab(lines)
-    # print(lab)
-    # print(g_row, g_col)
-    print("Part 1: Visited positions:", get_visits(lab, g_row, g_col))
+    visits = get_visits(lab, g_row, g_col)
+    print("Part 1: Visited positions:", visits)
+
 
 if __name__ == '__main__':
     main()