How to make an array of objects in python

Question

In Java, we make an array of objects with a fixed size as follows

ArrayClass array_of_objects[]=new ArrayClass[10];

but how can I make a list of objects in python with a fixed size?

Orion · Answer 1 · 2021-09-06T12:38:23.570

2

Create an empty list of size 5

lst = [None] * 5

edited Sep 06 '21 at 12:38

answered Sep 06 '21 at 12:37

Orion

this makes a list, but OP wanted an array. They are not the same, but very similar – Emi OB Sep 06 '21 at 12:37
3

@EmiOB I don't think that, coming from Java, the OP knows the difference, and most likely, they mean list. (Especially, considering the last sentence.) – bereal Sep 06 '21 at 12:39
I also think :D – Orion Sep 06 '21 at 12:40
This doesn't have a fixed size, though – OneCricketeer Sep 06 '21 at 12:41
2

@bereal fair point. Just thought it was important to note that they are two different things in python :) – Emi OB Sep 06 '21 at 12:42

I'mahdi · Answer 2 · 2021-09-06T12:41:48.557

2

use numpy like below:

import numpy as np
size = 2
np.array([None]*size, dtype=object)

Output:

array([None, None], dtype=object)

you can use this like below:

arr = np.array([None]*2, dtype=object)
arr[0] = 1
arr[1] = 'str'

Output:

array([1, 'str'], dtype=object)

edited Sep 06 '21 at 12:41

answered Sep 06 '21 at 12:37

I'mahdi

1

Numpy seems like overkill for the question asked – OneCricketeer Sep 06 '21 at 12:40
@OneCricketeer hahahah:))) – I'mahdi Sep 06 '21 at 12:43

2 Answers2