cutcutcodec.core.edit.operation.remove.remove_node

cutcutcodec.core.edit.operation.remove.remove_node(graph: MultiDiGraph, node: str) → dict[str | tuple[str, str, str], None | tuple[str, str, str]][source]

Delete a node from the graph.

Also deletes the edges linked to this node.

Parameters

graphnetwork.MultiDiGraph: The assembly graph containing the node to be deleted. The operations on this graph will be performed in-place.
nodestr: The name of the node to delete from the graph.

Returns

transformationsdict: Each old edge or node name is associated with its new name. If the new name is None, it means that the element has been deleted. This allows to be informed of all the operations performed.

Raises

KeyError: If the node is not in the graph.

Examples

>>> from pprint import pprint
>>> from cutcutcodec.core.classes.container import ContainerOutput
>>> from cutcutcodec.core.compilation.tree_to_graph import tree_to_graph
>>> from cutcutcodec.core.edit.operation.remove import remove_node
>>> from cutcutcodec.core.io.read_ffmpeg import ContainerInputFFMPEG
>>> from cutcutcodec.utils import get_project_root
>>> media = get_project_root() / "media" / "video" / "intro.webm"
>>> with (
...     ContainerInputFFMPEG(media) as container_1,
...     ContainerInputFFMPEG(media) as container_2,
... ):
...     tree = ContainerOutput([*container_1.out_streams, *container_2.out_streams])
...
>>> graph = tree_to_graph(tree)
>>> pprint(list(graph.edges))
[('container_input_ffmpeg_1', 'container_output_1', '0->0'),
 ('container_input_ffmpeg_1', 'container_output_1', '1->1'),
 ('container_input_ffmpeg_1', 'container_output_1', '2->2'),
 ('container_input_ffmpeg_1', 'container_output_1', '3->3'),
 ('container_input_ffmpeg_2', 'container_output_1', '0->4'),
 ('container_input_ffmpeg_2', 'container_output_1', '1->5'),
 ('container_input_ffmpeg_2', 'container_output_1', '2->6'),
 ('container_input_ffmpeg_2', 'container_output_1', '3->7')]
>>> pprint(list(graph.nodes))
['container_output_1', 'container_input_ffmpeg_1', 'container_input_ffmpeg_2']
>>> pprint(remove_node(graph, "container_input_ffmpeg_1"))
{'container_input_ffmpeg_1': None,
 ('container_input_ffmpeg_1', 'container_output_1', '0->0'): None,
 ('container_input_ffmpeg_1', 'container_output_1', '1->1'): None,
 ('container_input_ffmpeg_1', 'container_output_1', '2->2'): None,
 ('container_input_ffmpeg_1', 'container_output_1', '3->3'): None,
 ('container_input_ffmpeg_2', 'container_output_1', '0->4'): ('container_input_ffmpeg_2',
                                                              'container_output_1',
                                                              '0->0'),
 ('container_input_ffmpeg_2', 'container_output_1', '1->5'): ('container_input_ffmpeg_2',
                                                              'container_output_1',
                                                              '1->1'),
 ('container_input_ffmpeg_2', 'container_output_1', '2->6'): ('container_input_ffmpeg_2',
                                                              'container_output_1',
                                                              '2->2'),
 ('container_input_ffmpeg_2', 'container_output_1', '3->7'): ('container_input_ffmpeg_2',
                                                              'container_output_1',
                                                              '3->3')}
>>> pprint(list(graph.edges))
[('container_input_ffmpeg_2', 'container_output_1', '0->0'),
 ('container_input_ffmpeg_2', 'container_output_1', '1->1'),
 ('container_input_ffmpeg_2', 'container_output_1', '2->2'),
 ('container_input_ffmpeg_2', 'container_output_1', '3->3')]
>>> pprint(list(graph.nodes))
['container_output_1', 'container_input_ffmpeg_2']
>>>