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The PEP has some notes on this.

https://peps.python.org/pep-0810/#global-lazy-imports-contro...

https://peps.python.org/pep-0810/#making-the-new-behavior-th...

Completely nondeterministic import order affected by code execution patterns?

the main reason is import-time side effects, particularly intentional ones like the registry pattern.

also let me plug my work project, an analyser which will scan your code and see where it can safely enable lazy imports (tagged alpha, but we did our best to get a usable release out before 3.15 landed): https://github.com/Facebook/lifeguard

Very cool for large existing projects! I'll definitely be taking it out for a test drive on a codebase which is luckily using quite a recent py version (so should be easy to upgrade).

Also bonus points for the mascot :)