auto save

diy1.py

+import time
 list1 = []
+old_time = time.time()
 for a in range(0, 1000):
     for b in range(0, 1000):
-        list1.insert(0, 0)
\ No newline at end of file
+        list1.append(0)
+new_time = time.time()
+print(new_time-old_time)
\ No newline at end of file