Talk:Spiral matrix: Difference between revisions

== Python array initialisation edit problem ==

Hi Spoon, your edit to Spiral of substituting <python>array = [[None]*n]*n</python> for <python>array = [[None]*n for j in range(n)]</python> [[http://www.rosettacode.org/w/index.php?title=Spiral&curid=2967&diff=16906&oldid=16746 here]] doesn't work because of:

>>> a = [[None]*n]*n

>>> a

>>> a

[[1, None], [1, None]]

You are referencing the inner list multiple times instead of creating new copies. --[[User:Paddy3118|Paddy3118]] 06:17, 14 August 2008 (UTC)

:Oh yeah, sorry. You're right. --[[User:Spoon!|Spoon!]] 18:58, 14 August 2008 (UTC)