https://stackoverflow.com/questions/68964884/using-dask-throws-importerror-when-sagemath-code-is-run-in-python

According to the answer to this question, importing Sage calls signal, which causes the trouble.
(Other parts of the answer are irrelevant.)

CC: @jhpalmieri @slel

Component: porting

Issue created by migration from https://trac.sagemath.org/ticket/32477