how to create a big list of list

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if i want to create a list of list which size is 2**25

how should i do it?

i have try [ [] for x in xrange(2**25) ]

but it take too long to initial the list

is there any suggestion?

Thanks a lot!

 

[greg]

i have try [ [] for x in xrange(2**25) ]

Are you really going to be adding data to all
of those sublists?

If you're only using them sparsely, it may be
better to use a dictionary in place of the
top level list, and only add sublists as and
when necessary.

Recent Python versions have a built-in type
called defaultdict that makes this kind of
thing easy.