recover pickled data: pickle data was truncated

[iMath]

在 2021年12月30日星期四 UTC+8 03:13:21，<Marco Sulla> 写道：
> On Wed, 29 Dec 2021 at 18:33, iMath <redsto... at 163.com> wrote: 
> > But I found the size of the file of the shelve data didn't change much, so I guess the data are still in it , I just wonder any way to recover my data.
> I agree with Barry, Chris and Avi. IMHO your data is lost. Unpickling 
> it by hand is a harsh work and maybe unreliable. 
> 
> Is there any reason you can't simply add a semaphore to avoid writing 
> at the same time and re-run the code and regenerate the data?

Thanks for your replies! I didn't have a sense of adding a semaphore on writing to pickle data before, so  corrupted the data.
Since my data was colleted in the daily usage, so cannot re-run the code and regenerate the data.
In order to avoid corrupting my data again and the complicity of using  a semaphore, now I am using json text to store my data.