Python 3.7 added a new contextvars package to "manage, store, and access context-local state".

However, if I set a ContextVar in one cell and then try to get it in another, it isn't persisted:

This may be an antipattern (not sure if there is a good use case to set a variable across many cells) and I worked around it by setting default, as recommended. However it is surprising and is different than how ipython works.