id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
17128	Python 2.5-incompatible change in r16319 -- ModelAdmin.list_display.index method called	Simon Meers	Simon Meers	"r16319 introduced a python 2.5-incompatible change in which `ModelAdmin.list_display`'s `index` method is called despite the fact that it is likely a tuple (which only has an `index` method in 2.6+).

I imagine this managed to hide for so long because:
* No tests failed -- some use lists for list_display, and most don't have `ordering` set on the `ModelAdmin` or `Model.Meta`
* `ChangeLists` for which actions were present (which they are by default) have their `list_display` listified when `action_checkbox` is prepended (bypassed if rendering the `result_list` without using `changelist_view`)
* The number of people using Django trunk with Python 2.5 are no doubt a minority

I've attached a patch which addresses the issue and includes regression tests, which I'll commit unless someone thinks it could be done better."	Bug	closed	contrib.admin	dev	Normal	fixed	python 2.5, tuple, index, list_display		Ready for checkin	1	0	0	0	0	0