Read List in List

Question

I have a text file and there is 3 lines on data in it.

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

I try to open and get data in it.

with open("rafine.txt") as f:
    l = [line.strip() for line in f.readlines()]
    f.close()

now i have list in list.
if i say print(l[0]) it shows me [1, 2, 1, 1, 3, 1, 1, 2, 1, 3, 1, 1, 1, 3, 3]
But i want to get numbers in it.
So when i write print(l[0][0])
i want to see 1 but it show me [

how can i fix this ?

Asked By: onurhanozer

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Source

Answer 1

You can use literal_eval to parse the lines from the file & build the matrix:

from ast import literal_eval

with open("test.txt") as f:
    matrix = []
    for line in f:
        row = literal_eval(line)
        matrix.append(row)

print(matrix[0][0])
print(matrix[1][4])
print(matrix[2][8])

result:

1
3
1

Answered By: rdas

Answer 2

Try:

listoflists = []
for line in f.readlines():
    lst = [int(x) for x in line.strip()[1:-1].split(", ")]
    listoflists.append(lst)

The [1,-1] will remove the first and last character (the brackets), then split(", ") will split it into a list. for x in ... will iterate over the items in this list (assigning x to each item) and int(x) will convert x to an integer. lst then will contain the list for a single line, which is appended to listoflists.

Answered By: treuss

Answer 3

import json

with open("rafine.txt") as f:
   for line in f.readlines():
      line = json.loads(line)
      print(line)

Answered By: Axeltherabbit

Read List in List

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