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

[Isaac To]

>>>>> "Marcel" == Marcel  <marcel_achim at videotron.ca> writes:

    Marcel> Hi, I'm trying to allocate nested lists up-front using the
    Marcel> subject line, instead of generating : [ [ [], [], [] ], [ [],
    Marcel> [], [] ] ] I end up with : [ [], [ [], [], [] ] ]

    Marcel> I guess I screwed up something, but I'm failing to understand
    Marcel> what...

    Marcel> Any idea ?

Hint: range(3) means [0,1,2], so [[]*y for y in [0,1,2]] has first element
[], second [[]], third [[], []].

Regards,
Isaac.