id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc	work_issues	upstream	reviewer	author	merged	dependencies	stopgaps
7571	use more dicts in graph.py	ylchapuy	rlm	"This patch improves 3 methods in graph.py:

 * connected_components: we use python set instead of lists to enable fast lookup
 * blocks_and_cut_vertices: using dicts instead of lists enable us to avoid relabeling
 * girth: idem"	enhancement	closed	minor	sage-4.3	graph theory	fixed				N/A	Robert Miller	Yann Laigle-Chapuy	sage-4.3.alpha1