lisa.conf.DeferredValue

class lisa.conf.DeferredValue(callback, *args, **kwargs)

Bases: object

Wrapper similar to functools.partial() allowing to defer computation of the value until the key is accessed.

Once computed, the deferred value is replaced by the value that was computed. This is useful for values that are very costly to compute.

See also

Deferred values can be forcefully computed using eval_deferred(), e.g. to ensure a serialized configuration contains all the values an offline user might need.