Optional dependency guards (lazy_imports pattern)

Yggdrasil keeps most integrations optional. Import external libraries through yggdrasil.lazy_imports.

Safe imports

from yggdrasil.lazy_imports import polars
from yggdrasil.lazy_imports import pandas

These wrappers use runtime import/install guards so base installs stay lightweight.

Example

from yggdrasil.lazy_imports import polars

df = polars.DataFrame({"id": [1, 2], "value": [10.0, 20.0]})
print(df)