If bio fetch xxx is used with head at the same time, an error will be reported

[ChronoWeaver]

“bio fetch NC_045512 ”
LOCUS NC_045512 29903 bp ss-RNA linear VRL 18-JUL-2020
DEFINITION Severe acute respiratory syndrome coronavirus 2 isolate Wuhan-Hu-1,
complete genome.
...

it will work fine

but

"bio fetch NC_045512 | head"
LOCUS NC_045512 29903 bp ss-RNA linear VRL 18-JUL-2020
DEFINITION Severe acute respiratory syndrome coronavirus 2 isolate Wuhan-Hu-1,
complete genome.
..

it will also work fine，but It will also run fine, but with the following prompt.

/Users/guozhongfang/miniconda3/envs/bioinfo/lib/python3.8/multiprocessing/resource_tracker.py:216: UserWarning: resource_tracker: There appear to be 1 leaked semaphore objects to clean up at shutdown
warnings.warn('resource_tracker: There appear to be %d '

So I won't be able to execute the next command，I don't know why this is.
Hope to find a solution to the problem here. (M1 Macbook pro)

[ialbert]

This is an official bug in Python, when you Google the error you will find many instances of people getting it. But not everyone sees it.

python/cpython#89372

It only appears when you interrupt the stream (head/tail etc) but it is very annoying indeed,

But it does not affect the data other than printing the distracting message.

There may be workarounds by updating certain libraries but since I can't reproduce I don't have a good test case.

[ChronoWeaver]

Thanks for your prompt reply, then I'll put this question aside for now, thanks again.