auto save

diy1.py

+import time
+start=time.time()
+print(start)
 list1 = []
 for a in range(0, 1000):
     for b in range(0, 1000):
-        list1.insert(0, 0)
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+        list1.insert(0,'a')
+#        c=1000-a-b
+ #       if a**2+b**2==c**2:
+  #          print(a,b,c)
+print(list1)
+end=time.time()
+print(end)
+r=end-start
+print('用时：',r)
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