Complete day 3

03/input

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03/part1

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+#!/usr/bin/python3
+
+slope = []
+with open("input") as fh:
+    for ln in fh:
+        row = []
+        for c in ln:
+            if c == "#":
+                row.append(True)
+            elif c == ".":
+                row.append(False)
+            elif c == "\n":
+                pass
+            else:
+                raise RuntimeError("impossible")
+        slope.append(row)
+xmod = len(slope[0])
+x = 0
+y = 0
+trees = 0
+while y < len(slope):
+    trees += slope[y][x % xmod]
+    x += 3
+    y += 1
+print(trees)

03/part2

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+#!/usr/bin/python3
+
+slope = []
+with open("input") as fh:
+    for ln in fh:
+        row = []
+        for c in ln:
+            if c == "#":
+                row.append(True)
+            elif c == ".":
+                row.append(False)
+            elif c == "\n":
+                pass
+            else:
+                raise RuntimeError("impossible")
+        slope.append(row)
+def trees(slope, right, down):
+    xmod = len(slope[0])
+    x = 0
+    y = 0
+    trees = 0
+    while y < len(slope):
+        trees += slope[y][x % xmod]
+        x += right
+        y += down
+    print(right, down, trees)
+    return trees
+
+t1 = (trees(slope, 1, 1))
+t2 = (trees(slope, 3, 1))
+t3 = (trees(slope, 5, 1))
+t4 = (trees(slope, 7, 1))
+t5 = (trees(slope, 1, 2))
+print(t1 * t2 * t3 * t4 * t5)