import time

start_time = time.time()    # 开始时间
print("开始时间为：", start_time)

list1 = []
for a in range(0, 1000):
    for b in range(0, 1000):
        list1.insert(0, 0)
end_time = time.time()      # 结束时间
print("结束时间为：", end_time)

result = end_time - start_time
print("总共耗时：", result)