How to create an immutable Numpy array?

Let’s check how to create an immutable Numpy array.

To make the array immutable you need to set writeable flag as false.

import numpy as np

my_array = np.array([1, 2, 3])
print(my_array)

my_array[1] = 5
print(my_array)

my_array.flags.writeable = False

my_array[2] = 6
print(my_array)

As you can see it is not possible to change the array. Python displays assignment destination is read-only ValueError.

Traceback (most recent call last):
  File "C:\Users\pythoneo\PycharmProjects\pythoneoProject\immutable_array_python.py", line 11, in 
    my_array[2] = 6
ValueError: assignment destination is read-only

Setting writeable flag made your immutable. To turn off read-only mode you need to set writeable flag back to true.