On 2017-11-17, eth0 <ethernet.z...@gmail.com> wrote:
> On Fri, 17 Nov 2017 00:04:16 +0000 in comp.lang.python, MRAB said:
>> On 2017-11-16 18:47, jakub.raj...@gmail.com wrote:
>> > Hello, im working on school project, its deck game Sorry!
>> > I need to create specific lists:
>> > My idea is about to using for
>> > For i in range (n):
>> > i=[]
>> > I know, that there is no possibility to make it from number, but
>> > i havent idea, how to reach my wants Li/L"i"/L(i), how to make
>> > possible for lists?
>> >
>> >
>> If you want multiple lists, make a list of lists:
>>
>> my_lists = []
>>
>> for i in range(n):
>> my_lists.append([])
>>
>> Then you can say my_lists[0], my_lists[1], etc.
>
> It'd be even shorter using a list comprehension:
>
> my_lists = [[] for i in range(n)]
>
> And _even shorter still_ just using the multiply operator:
>
> my_lists = [[]] * n
$ python
Python 2.7.14 (default, Nov 2 2017, 11:45:51)
[GCC 5.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> x = [[] for i in 1,2,3,4]
>>> x
[[], [], [], []]
>>> y = [[]] * 4
>>> y
[[], [], [], []]
>>> x[0].append(1)
>>> y[0].append(1)
>>> x
[[1], [], [], []]
>>> y
[[1], [1], [1], [1]]
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at yet?
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