Looked up solution for part 2 of day 13

13/part2.py

@@ -0,0 +1,16 @@
+
+def getBuses(filename):
+	with open(filename, "r") as f:
+		f.readline()
+		return {i:int(x) for i, x in enumerate(f.readline().split(",")) if x != "x"}
+
+buses = getBuses("input.txt")
+step = list(buses.values())[0]
+t = step
+
+for dt, busId in buses.items():
+	while (t + dt) % busId != 0:
+		t += step
+	step *= busId
+
+print(t)