If that is the only way. They need to change some semantics around import statements to not be runtime conditional. (Mypy can do it without running the code so

If that is the only way. They need to change some semantics around import statements to not be runtime conditional. (Mypy can do it without running the code so to some extent it is possible). With that in place, each module can at the top declare #nogilsafe and the interpreter can know that no more modules will be loaded runtime. Dynamic imports via importlib will need other consideration. Expecting every transitive module to add this marker is very optimistic though. It’s thousands of packages with hundreds of modules each, that need to add this everywhere. Other languages have done similar journeys, like typescript “strict” added at top of each file. Except those are a lot more local, by not expecting all dependencies to follow.