Complete day 15, part 1

15/part1

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+#!/usr/bin/python3
+
+import sys
+import time
+from pprint import pprint
+
+turn = 0
+num = None
+last_turn = {}
+
+for a in sys.argv[1:]:
+    last_turn[num] = turn
+    turn += 1
+    num = int(a)
+
+pprint(last_turn)
+
+while True:
+    if num in last_turn:
+        new_num = turn - last_turn[num]
+    else:
+        new_num = 0
+    last_turn[num] = turn
+    num = new_num
+    turn += 1
+    print(turn, num)
+    if turn >= 2020:
+        break
+