HOW TO READ LINE FROM A TEXT FILE INTO AN 2D ARRAY IN PYTHON

Question

So, the text file looks like this: [[7, 5, 3], [3, 2, 2], [9, 0, 2], [2, 2, 2], [4, 3, 3]]

The question is how can I read the line and make it a 2d array that has 5 rows and 3 columns? I have tried this code but this error came out "ValueError: cannot reshape array of size 1 into shape (5,3)"

file = open("test.txt", "r")
allocation = np.array(file.readline())
all = np.reshape(allocation, (5,3))
print(allocation)

file.close()

Sorry if the question has already been asked before but I don't really understand other solutions. Thank you.

Either intentionally or coincidentally, but that file is a JSON, and you could load it with json.load(). — tevemadar
– tevemadar, Commented May 18, 2022 at 16:15
Since no one but use has a that file, your example should hardcode the value returned by file.readline() — Paul H
– Paul H, Commented May 18, 2022 at 16:20

Tim Biegeleisen · Accepted Answer · 2022-05-18 16:15:19Z

2

One straightforward approach uses the eval() function:

inp = "[[7, 5, 3], [3, 2, 2], [9, 0, 2], [2, 2, 2], [4, 3, 3]]"
arr = eval(inp)
print(arr)  # [[7, 5, 3], [3, 2, 2], [9, 0, 2], [2, 2, 2], [4, 3, 3]]
print(arr[1][1])  # 2

answered May 18, 2022 at 16:15

Tim Biegeleisen

526k32 gold badges324 silver badges399 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

HOW TO READ LINE FROM A TEXT FILE INTO AN 2D ARRAY IN PYTHON

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related