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added a new clear method to clear all vertices, edges, left and right sets #39760

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added a new clear method to clear all vertices, edges, left and right sets #39760

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added a new clear method to clear all vertices, edges, left and right…
Krishnadubey1008 Mar 23, 2025
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added changes to comply with the coding style
Krishnadubey1008 Mar 23, 2025
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Krishnadubey1008 Mar 23, 2025
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19 changes: 19 additions & 0 deletions src/sage/graphs/bipartite_graph.py
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Expand Up @@ -558,6 +558,25 @@ def __init__(self, data=None, partition=None, check=True, hash_labels=None, *arg
self._hash_labels = hash_labels

return

def clear(self):
"""
Clear all the vertices and edges in the graph.

This method will also clear the left and right vertex sets.
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Something like that would be more informative

This method extends the functionality of method :meth:`~sage.graphs.generic_graph.GenericGraph.clear` to also clear vertex sets `left` and `right`.


EXAMPLES::

sage: B = BipartiteGraph(graphs.CompleteBipartiteGraph(7, 9))
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a smaller example like graphs.CycleGraph(4) or even a single edge is sufficient.

sage: B.clear()
sage: B.left
set()
sage: B.right
set()
"""
super().clear()
self.left.clear()
self.right.clear()

@cached_method
def __hash__(self):
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