auto save

diy1.py

+import time
+start_time=time.time()
+print("开始时间：",start_time)
 list1 = []
 for a in range(0, 1000):
     for b in range(0, 1000):
-        list1.insert(0, 0)
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+        list1.append(0)
+end_time=time.time()
+print("结束时间：",end_time)
+result=end_time-start_time
+print("总耗时：",result)
\ No newline at end of file