How to initialize n number of different list?

Question

I am trying to create n number of lists like

a_1 = [some data]
a_2 = [some data]
a_3 = [some data]
.          .
.          .
.          .
.          .
.          .
a_n = [some data]

I thought for looping would help

for i in range(10):
    a_i = []
    print(a_i)

My approach is fully wrong because the output I was expecting should be like

a_1 = [some data]
a_2 = [some data]
a_3 = [some data]
.          .
.          .
.          .
.          .
.          .
a_n = [some data]

instead of

[]
[]
[]
[]
[]
[]
[]
[]
[]
[]

Any help would be highly appreciated.

Where is your data stored or how you are getting it? Please mentioned that as well. — Jayesh Dhandha, Sep 24 '19 at 07:34
ignore the data part just help me with n number of empty list , however the list should be initialized like the way I have mentioned @JayeshDhandha — Ebad, Sep 24 '19 at 07:36
If you will not apply any data than what approach you have done is fine! It will be empty list. — Jayesh Dhandha, Sep 24 '19 at 07:39
but the whole output is now under a_i, the output I want is a_1 =[] , a_2 =[], ....a_n = [] @JayeshDhandha — Ebad, Sep 24 '19 at 07:41
that approach won't help me, the problem I am solving is I am getting n number of different inputs and I have to save it in n number of different lists with different initialization @JayeshDhandha — Ebad, Sep 24 '19 at 07:51
yes almost duplicate but I got the idea thank you @JayeshDhandha — Ebad, Sep 24 '19 at 07:54
Please paste your answer so that others can get benefit of it. If it's different than the one which told. Thanks! — Jayesh Dhandha, Sep 24 '19 at 09:34
With your approach, in each loop `a_i` is overwritten each time. It does not take the values a_1, a_2 etc, it just reinitialize the list a_i over and over. — liakoyras, Sep 24 '19 at 13:14

Demi-Lune · Accepted Answer · 2019-09-24T13:03:42.367

0

You could also:

for i in range(5):
    exec('a_%d = []'%i)

Don't know if it has (dis)advantages over the globals method suggested in one of the comments.

edited Sep 24 '19 at 13:03

answered Sep 24 '19 at 10:01

Demi-Lune

score 0 · Answer 2 · answered Sep 24 '19 at 13:09

0

Could try:

list_of_lists = []
for i in range(10):
    a_i = [] # put some data on the list
    list_of_lists.append(a_i)
print(lists_of_lists)

answered Sep 24 '19 at 13:09

Rob

2 Answers2