Calling clear() on BipartiteGraph does not clear left and right vertex sets #39756
Description
Steps To Reproduce
sage: B = BipartiteGraph([(0,2), (0,3), (1,2), (1,3)])
sage: B.left, B.right
({0, 1}, {2, 3})
sage: B.clear()
sage: B.left, B.right
({0, 1}, {2, 3})Expected Behavior
should return empty sets (set(), set()).
Actual Behavior
The vertex sets left and right are not cleared, returning their original value before B.clear() was called.
Additional Information
No response
Environment
- OS: Ubuntu 24.04.2
- Sage Version: 10.6
Checklist
- I have searched the existing issues for a bug report that matches the one I want to file, without success.
- I have read the documentation and troubleshoot guide