some progress on advent of code

day2_2.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+import sys, utils
+
+def where_are_we_going2(l: list):
+    h, v = 0, 0
+    aim = 0
+    for d in l:
+        d = d.split()
+        n = int(d[1])
+        if d[0] == 'forward':
+            h += n 
+            v += aim * n
+        elif d[0] == 'down':
+            aim += n
+        elif d[0] == 'up':
+            aim -= n
+    return h * v 
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print("please supply input file")
+        sys.exit()
+
+    f = utils.File(sys.argv[1])
+
+    print(where_are_we_going2(f.get_strings()))
+
+