用时间当作文件名可以避免新数据把旧的覆盖
python
import time
#python自带的库,不需要安装
localTime = time.localtime(time.time());
filename = str(localTime.tm_mon) + '_' + str(localTime.tm_mday) + '_' +
str(localTime.tm_hour) + '_' + str(localTime.tm_min) + '_' + str(localTime.tm_sec)
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