generating list of sub lists

[cesco]

Hi,

is there a one-liner to accomplish the following task?

From the list

l = ['string1', 'string2', 'string3']
generate the list of lists
l = [['string1'], ['string1', 'string2'], ['string1', 'string2',
'string3']]

Any help would be appreciated.

Thanks
Francesco

 

[=?ISO-8859-15?Q?Jes=FAs_Carrete_Monta=F1a?=]

l = ['string1', 'string2', 'string3']

l2=[l[:i+1] for i in range(len(l))]

 

[Rustom Mody]

Hi,

is there a one-liner to accomplish the following task?

From the list

l = ['string1', 'string2', 'string3']
generate the list of lists
l = [['string1'], ['string1', 'string2'], ['string1', 'string2',
'string3']]

Any help would be appreciated.

Thanks
Francesco

l = [1,2,3,4,5]
[l[:i] for i in range(len(l))] [[], [1], [1, 2], [1, 2, 3], [1, 2, 3, 4]]

well almost works except for the first empty list. [Are you sure you
dont want it?]

Corrected

[l[:i+1] for i in range(len(l)-1)]

[[1], [1, 2], [1, 2, 3], [1, 2, 3, 4]]

Though I wonder if there is as neat a way as the first?

 

[Steve Holden]

Hi,

is there a one-liner to accomplish the following task?

From the list

l = ['string1', 'string2', 'string3']
generate the list of lists
l = [['string1'], ['string1', 'string2'], ['string1', 'string2',
'string3']]

Any help would be appreciated.

Thanks
Francesco

l = [1,2,3,4,5]
[l[:i] for i in range(len(l))]

[[], [1], [1, 2], [1, 2, 3], [1, 2, 3, 4]]
well almost works except for the first empty list. [Are you sure you
dont want it?]

Corrected

[l[:i+1] for i in range(len(l)-1)]

[[1], [1, 2], [1, 2, 3], [1, 2, 3, 4]]

Though I wonder if there is as neat a way as the first?

>>> [l[:i] for i in range(1, len(l))] [[1], [1, 2], [1, 2, 3], [1, 2, 3, 4]]
>>>

seems a slightly neater way to meet the requirement.

regards
steve
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Skype: holdenweb http://del.icio.us/steve.holden

Sorry, the dog ate my .sigline

 

[Ross Wilson]

Hi,

is there a one-liner to accomplish the following task?

From the list

l = ['string1', 'string2', 'string3']
generate the list of lists
l = [['string1'], ['string1', 'string2'], ['string1', 'string2',
'string3']]

Any help would be appreciated.

Thanks
Francesco

l = [l, l]

Ross

 

[Steven D'Aprano]

Hi,

is there a one-liner to accomplish the following task?

From the list

l = ['string1', 'string2', 'string3'] generate the list of lists
l = [['string1'], ['string1', 'string2'], ['string1', 'string2',
'string3']]

Any help would be appreciated.

Thanks
Francesco

l = [l, l]

Ross

Did you *try* your suggestion before posting?

l = ['string1', 'string2', 'string3']
assert [l, l] == [['string1'], ['string1', 'string2'],

.... ['string1', 'string2', 'string3']]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AssertionError


What you've suggested doesn't even come close to what the Original Poster
is asking for.