element_51.engine

Run a graph: call each node’s function in dependency order.

Functions

ancestors(graph, node)	Return the nodes node needs, directly or not.
closure(graph, nodes)	Return nodes and everything they need.
collect_outputs(function, result)	Check what a node returned and turn it into a value per output port.
descendants(graph, node)	Return the nodes that need node, directly or not.
describe_error(error)	Return an error as one line.
resolve_inputs(node, incoming, function, ...)	Find the value of each of a node's inputs.
run_graph(graph, functions, *, raise_errors)	Run every node once, upstream nodes first.

Classes

NodeOutcome(*, node, status[, outputs, ...])	What happened to one node in a run.
RunResult(*[, op, partial])	The outcome of every node, in the order they ran.

Exceptions

BadReturnError	A node function returned a value its output port cannot carry.
MissingInputError	An input has neither a link nor a default.