Store data from txt file into lists of lists

Question

I am trying to parse data from a text file. I want to store each of the 9 numbers in a separate list, making it a list of lists. Here's what I have, I am not quite sure how to go from here.

file = open("data.txt", 'r')
Result = [line.split(',') for line in file.readlines()]

print(Result)

Here is what the txt file looks like:

3 7 5 
0 4 2 
8 1 6 

2 6 3 
1 0 8 
5 4 7 

4 1 6 
0 8 7 
2 3 5 

7 2 6 
4 1 3 
8 0 5 

This is my output:

[['3 7 5 \n'], ['0 4 2 \n'], ['8 1 6 \n'], ['\n'], ['2 6 3 \n'], ['1 0 8 \n'], ['5 4 7 \n'], ['\n'], ['4 1 6 \n'], ['0 8 7 \n'], ['2 3 5 \n'], ['\n'], ['7 2 6 \n'], ['4 1 3 \n'], ['8 0 5 \n'],['\n']]

Answer 1

you split() on space which is default

res=[line.split() for line in file.readlines() if line.strip()]
>>>res
[['3', '7', '5'], ['0', '4', '2'], ['8', '1', '6'], ['2', '6', '3'], ['1', '0', '8'], ['5', '4', '7'], ['4', '1', '6'], ['0', '8', '7'], ['2', '3', '5'], ['7', '2', '6'], ['4', '1', '3'], ['8', '0', '5']]

if you want in a list of list

res =[]
sub =[]
for line in file.readlines():
    if line.strip():
        sub.append(line.split())
    else:
        res.append(sub)
        sub=[]

>>>res
[[['3', '7', '5'], ['0', '4', '2'], ['8', '1', '6']], [['2', '6', '3'], ['1', '0', '8'], ['5', '4', '7']], [['4', '1', '6'], ['0', '8', '7'], ['2', '3', '5']]]

if you want all 9 numbers in in a single list, use extend instead of append

res =[]
sub =[]
for line in file.readlines():
    if line.strip():
        sub.extend(line.split())
    else:
        res.append(sub)
        sub=[]
>>>res
[['3', '7', '5', '0', '4', '2', '8', '1', '6'], ['2', '6', '3', '1', '0', '8', '5', '4', '7'], ['4', '1', '6', '0', '8', '7', '2', '3', '5']]

if you want to convert all to integers convert using int()

sub.extend([int(x) for x in line.split()])

Answer 2

You can use below logic.

        listoflists = []
        list = []
        file = open('data.txt', 'r')
        for line in file.readlines():
            for n in line:
                if (n!=" " and  n!="\n"):
                    list.append(n)
                if line == '\n':
                    listoflists.append(list)
                    list=[]
        print(listoflists)

Result [['3', '7', '5', '0', '4', '2', '8', '1', '6'], ['2', '6', '3', '1', '0', '8', '5', '4', '7'], ['4', '1', '6', '0', '8', '7', '2', '3', '5']]

Answer 3

Try this,you can define number of items for each list and pass it to chunks function

file = open("data.txt", 'r')
l = list(filter(None,file.read().splitlines()))
l = list(filter(None," ".join(l).split(' ')))

def chunks(li,n):
    for i in range(0,len(li),n):
            yield li[i:i+n]

out = list(chunks(l,9))

output

[['3', '7', '5', '0', '4', '2', '8', '1', '6'],
 ['2', '6', '3', '1', '0', '8', '5', '4', '7'],
 ['4', '1', '6', '0', '8', '7', '2', '3', '5'],
 ['7', '2', '6', '4', '1', '3', '8', '0', '5']]