On Feb 7, 11:38 am, [EMAIL PROTECTED] wrote: > Hallo, > > I'm after > > [[[],[],[],[],[]],[[],[],[],[],[]],[[],[],[],[],[]],[[],[],[],[],[]],[[],[],[],[],[]]] > > (NxN 'grid', 5x5 in that example, and while typing this up i figured out > how to get it, but I'm still not sure what _was_ happening) > > I'm trying > > >>>> a=[] > >>> row=[ [] for n in range(0,10) ] > >>> a.extend(row[:]) > >>> a > > [[], [], [], [], [], [], [], [], [], []]>>> a[0].extend(row[:]) > >>> a > > [[[...], [], [], [], [], [], [], [], [], []], [], [], [], [], [], [], [], > [], []] > > why isnt that last a > > [[[...]],[],[],[],[],[],[],[],[],[]] > > Puzzled :)
I don't see why you should get either. Especially considering this behaviour: >>> a=[] >>> row=[ [] for n in range(0,10) ] >>> a.extend(row[:]) >>> a [[], [], [], [], [], [], [], [], [], []] >>> a[0].extend(row[:]) >>> a [[[...], [], [], [], [], [], [], [], [], []], [], [], [], [], [], [], [], [], []] >>> a[0][0][0][0][0][0][0][0][0][0][0][0][0][0] [[...], [], [], [], [], [], [], [], [], []] >>> a=[] >>> row=[ [] for n in range(0,10) ] >>> a.extend(row[:]) >>> a [[], [], [], [], [], [], [], [], [], []] Bug in IDLE? > > Matt. > -- > > This message and any attachments (the "message") is > intended solely for the addressees and is confidential. > If you receive this message in error, please delete it and > immediately notify the sender. Any use not in accord with > its purpose, any dissemination or disclosure, either whole > or partial, is prohibited except formal approval. The internet > can not guarantee the integrity of this message. > BNP PARIBAS (and its subsidiaries) shall (will) not > therefore be liable for the message if modified. > Do not print this message unless it is necessary, > consider the environment. > > --------------------------------------------- > > Ce message et toutes les pieces jointes (ci-apres le > "message") sont etablis a l'intention exclusive de ses > destinataires et sont confidentiels. Si vous recevez ce > message par erreur, merci de le detruire et d'en avertir > immediatement l'expediteur. Toute utilisation de ce > message non conforme a sa destination, toute diffusion > ou toute publication, totale ou partielle, est interdite, sauf > autorisation expresse. L'internet ne permettant pas > d'assurer l'integrite de ce message, BNP PARIBAS (et ses > filiales) decline(nt) toute responsabilite au titre de ce > message, dans l'hypothese ou il aurait ete modifie. > N'imprimez ce message que si necessaire, > pensez a l'environnement. -- http://mail.python.org/mailman/listinfo/python-list
