Converting text file into 2-dim array in python

Question

I have a text file (let's call it file.txt) of containing only 1 line of this type:

[1,2,3],[4,5,6],[7,8,9],[10,11,12],[13,14,15]

I want to convert that into a 2-dim array in python so that I will get

[[1 2 3]

[4 5 6]

[7 8 9]

[10 11 12]

[12 14 15]]

I tried using

with open("file.txt", "r") as f:

data = f.readlines()

c = np.array(data)

print(c)

c.dtype

But it returns me ['[1,2,3],[4,5,6],[7,8,9],[10,11,12]'] and dtype('<U34')

Can somebody help me with this?

Ps. Above is just an example. In reality I will work on arbitrary size 2-dim array

azro · Accepted Answer · 2022-07-12 08:24:14Z

5

Use json to help you

with open("file.txt", "r") as f:
    content = "[" + f.read() + "]"

values = json.loads(content)

values_np = np.array(values)

answered Jul 12, 2022 at 8:24

azro

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2 Comments

user19532602 Over a year ago

Thank you. That's useful. I am new to coding world and new to stack overflow forum. I realized you changed the text (code) in my question. Just how did you type the code in that nice format? Sorry if this is noob question to you.

azro Over a year ago

@user19532602 click on edit below your post and you'll see it, it used ` (backquote)

Jishnu Prakash · Accepted Answer · 2022-07-12 08:32:18Z

0

You can use eval

import numpy as np

str_array = open('file.txt', 'r').read()

arr = np.array(eval(str_array))

answered Jul 12, 2022 at 8:32

Jishnu Prakash

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