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diy1.py

-import time
-start_time = time.time()
-print('开始时间为:' , start_time)
-list1 = []
-for a in range(0, 1000):
-    for b in range(0, 1000):
-        list1.append(9)
-end_time = time.time()
-print('结束时间为:' , start_time)
-result = end_time - start_time
-print('总共耗时:' ,result)
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