solved day 4, part 1!

brechtje/4/4-1.py

@@ -0,0 +1,34 @@
+input = open('input.txt', 'r').read().splitlines()
+
+surrounding_spaces = [
+    {'x': -1, 'y': -1},
+    {'x': 0, 'y': -1},
+    {'x': 1, 'y': -1},
+    {'x': -1, 'y': 0},
+    {'x': 1, 'y': 0},
+    {'x': -1, 'y': 1},
+    {'x': 0, 'y': 1},
+    {'x': 1, 'y': 1}
+]
+
+answer = 0
+x_max = len(input[0]) - 1
+y_max = len(input) - 1
+
+for y, line in enumerate(input):
+    for x, char in enumerate(line):
+        if char == "@":
+            rolls = 0
+            for space in surrounding_spaces:
+                current_x = x + space['x']
+                current_y = y + space['y']
+                if current_x < 0 or current_y < 0 or current_x > x_max or current_y > y_max:
+                    continue
+                elif input[current_y][current_x] == "@":
+                    rolls += 1
+                if rolls > 3:
+                    break
+            if rolls < 4:
+                answer += 1
+
+print(answer)