Re: initialized list: strange behavior

Steve Holden <[EMAIL PROTECTED]> writes: > Arnaud Delobelle wrote: >> Jason Scheirer <[EMAIL PROTECTED]> writes: >>> Python is pass-by-reference, not pass-by-value. >> >> It's certainly not pass-by-reference, nor is it pass-by-value IMHO. >> > Since no lists are being passed as arguments in thes

Re: initialized list: strange behavior

The issue is exhausted in Python Library Reference, Chapter 3.6, so I should apologize for initial posting. All comments were helpful, though Arnaud and Steve are right that pass-by-anything is off the point. Thanks All! -- http://mail.python.org/mailman/listinfo/python-list

Re: initialized list: strange behavior

Arnaud Delobelle wrote: > Jason Scheirer <[EMAIL PROTECTED]> writes: > >> On Nov 24, 10:34 pm, [EMAIL PROTECTED] wrote: >>> Hi Python experts! Please explain this behavior: >>> >> nn=3*[[]] >> nn >>> [[], [], []] >> mm=[[],[],[]] >> mm >>> [[], [], []] >>> >>> Up till now, 'mm' and

Re: initialized list: strange behavior

On Tue, Nov 25, 2008 at 9:23 AM, Arnaud Delobelle <[EMAIL PROTECTED]>wrote: > Jason Scheirer <[EMAIL PROTECTED]> writes: > > > On Nov 24, 10:34 pm, [EMAIL PROTECTED] wrote: > >> Hi Python experts! Please explain this behavior: > >> > >> >>> nn=3*[[]] > >> >>> nn > >> [[], [], []] > >> >>> mm=[[],[

Re: initialized list: strange behavior

Jason Scheirer <[EMAIL PROTECTED]> writes: > On Nov 24, 10:34 pm, [EMAIL PROTECTED] wrote: >> Hi Python experts! Please explain this behavior: >> >> >>> nn=3*[[]] >> >>> nn >> [[], [], []] >> >>> mm=[[],[],[]] >> >>> mm >> >> [[], [], []] >> >> Up till now, 'mm' and 'nn' look the same, right? Nope

Re: initialized list: strange behavior

On Nov 24, 10:34 pm, [EMAIL PROTECTED] wrote: > Hi Python experts! Please explain this behavior: > > >>> nn=3*[[]] > >>> nn > [[], [], []] > >>> mm=[[],[],[]] > >>> mm > > [[], [], []] > > Up till now, 'mm' and 'nn' look the same, right? Nope! > > >>> mm[1].append(17) > >>> mm > [[], [17], []] > >>

Re: initialized list: strange behavior

[EMAIL PROTECTED] wrote: > Hi Python experts! Please explain this behavior: > [] make an empty list. [ [],[],[] ] makes a list of three different empty lists. 3*[[]] makes a list of three references to the same list. Realy, that should explain it all, but perhaps there are enough empty lists

initialized list: strange behavior

Hi Python experts! Please explain this behavior: >>> nn=3*[[]] >>> nn [[], [], []] >>> mm=[[],[],[]] >>> mm [[], [], []] Up till now, 'mm' and 'nn' look the same, right? Nope! >>> mm[1].append(17) >>> mm [[], [17], []] >>> nn[1].append(17) >>> nn [[17], [17], [17]] ??? Python 2.5 Win XP Thank