collect_env(env=None)
This grabs environment variables of the form "DASK_FOO__BAR_BAZ=123" and turns these into config variables of the form {"foo": {"bar-baz": 123}}
It transforms the key and value in the following way:
Lower-cases the key text
Treats __
(double-underscore) as nested access
Calls ast.literal_eval
on the value
Any serialized config passed via DASK_INTERNAL_INHERIT_CONFIG
is also set here.
Collect config from environment variables
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