Experimental Physics and
Industrial Control System

Thanks for your replies, Tom, Michael, and Matt.

 

It looks like indeed the problem is that pyepics is using a different version of the EPICS libraries. I might have been confused about how this is done.

 

I installed pyepics and p4p using pip, and it was fetching epicscorelibs, but then I was setting PYEPICS_LIBCA to use a patched 7.0.4 to fix a couple of other issues I was having (https://github.com/epics-base/pva2pva/pull/34, https://github.com/epics-base/epics-base/issues/83).

It seems that pyepics is using that environment variable, but p4p is ignoring it, so each module is trying to load different versions of the libraries. I was probably lucky that it worked in the past with Python 3.7.3 on macos Mojave and on Python 2.7.