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
36519	The center template filter is inconsistent when adding an odd amount of padding	Lily Acorn	Mridul	"Django supports a template filter for centering strings: `{{ ""Django""|center:10 }}` which adds padding around the string to reach the provided length. In this simple case, the template is rendered as `··Django··` (where `·` represents a space character).

Things get weird when the total amount of padding required is an odd number. For example, `{{ ""odd""|center:6 }}` becomes `·odd··`, but `{{ ""even""|center:7 }}` becomes `··even·`. Note that the side with the extra space character is inconsistent.

The cause of this quirk is that Django’s `center` filter directly calls Python’s `str.center` method, [https://github.com/python/cpython/issues/67812 which maintains this behaviour for backwards compatibilty reasons].

Python also supports centering via f-strings (and `str.format`):

{{{
>>> f""{'odd':^6}""
'·odd··'
>>> f""{'even':^7}""
'·even··'
}}}

and this behaves consistently - always adding the extra unpaired space on the right.

I think Django should match the f-string behaviour here."	Bug	closed	Template system	5.2	Normal	fixed	center filter		Ready for checkin	1	0	0	0	1	0