foo@__init__.py

print("executing foo/__init__.py")

foo@bar.py

print("executing foo/bar.py")


class RandomClass:
    print("executing RandomClass body")

    def __init__(self) -> None:
        print("executing RandomClass.__init__")

lazy_import_demo.py

print("before lazy import")

lazy from foo.bar import RandomClass

print("after lazy import")
print("before first use")

instance = RandomClass()

print("after first use")
print(f"instance type: {type(instance).__name__}")

shell.sh

simone@simones-Apple-MacBook-Pro tmp.zEmX5KWOEG % uv run python lazy_import_demo.py
before lazy import
after lazy import
before first use
executing foo/__init__.py
executing foo/bar.py
executing RandomClass body
executing RandomClass.__init__
after first use
instance type: RandomClass