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如何把需要的数值存到sd卡中，不是图片。
我现在存进去了，可是这是个字符，我想的我的这个变量一直在变，然后如何存呢？。
使用python自带的open，和write就能写进去。
https://cn.bing.com/search?q=python3+文件写入&qs=n&form=QBLH&sp=-1&pq=python3+文件写入&sc=0-12&sk=&cvid=0CFCC0A3A99E4C32AB74C42A12BE5ED8
至于“我想的我的这个变量一直在变，然后如何存呢”，我不知道你要做什么。