Bernard Lidicky reported me the following issue with method is_line_graph.
I don't know how to fix that and I opened ticket
https://trac.sagemath.org/ticket/29740
sage: g = Graph('O{e[{}^~z`MDZBZBkXzE^')
sage: g.is_line_graph()
---------------------------------------------------------------------------
Exception Traceback (most recent call last)
<ipython-input-2-6f1d1161d3c4> in <module>()
----> 1 g.is_line_graph()
/Users/dcoudert/sage/local/lib/python3.7/site-packages/sage/graphs/
line_graph.pyx in sage.graphs.line_graph.is_line_graph (build/cythonized/
sage/graphs/line_graph.c:2286)()
* 220* if g.is_connected():
* 221* try:
--> 222 R, isom = root_graph(g)
* 223* if certificate:
* 224* return True, R, isom
/Users/dcoudert/sage/local/lib/python3.7/site-packages/sage/graphs/
line_graph.pyx in sage.graphs.line_graph.root_graph (build/cythonized/sage/
graphs/line_graph.c:7147)()
* 621*
* 622* if not is_isom:
--> 623 raise Exception(error_message)
* 624*
* 625* return R, isom
Exception: It looks like there is a problem somewhere. Youfound a bug here !
Please report it on sage-devel,our google group !
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