[ [ [] * y for y in range(3) ] * x for x in range(2) ]

[David Eppstein]

In article <2vhh3v4ue9tsn5lgk6lpl7cd92i2s8fgh9 at 4ax.com>,
 Chirayu Krishnappa <thephoenix235 at gmx.net> wrote:

> This is whats wrong.
> 
> >>> L=[[[]]*3]*2
> >>> L
> [[[], [], []], [[], [], []]]
> >>> L[0][0]=1
> >>> L
> [[1, [], []], [1, [], []]]

Ok, you want a 2x3 table of 6 distinct empty lists...

[[[] for x in range(3)] for y in range(2)]

-- 
David Eppstein       UC Irvine Dept. of Information & Computer Science
eppstein at ics.uci.edu http://www.ics.uci.edu/~eppstein/