how to solve 'numpy.ndarray' object has no attribute 'extend'

The 'numpy.ndarray' object does not have an 'extend' method, so you cannot use it directly to add elements to an array. Instead, you can use the numpy.concatenate() method to combine two arrays.

Here is an example of how to use concatenate to add new elements to an existing array:

import numpy as np

# create an initial array
arr = np.array([1, 2, 3])

# create a new array of elements to add
new_arr = np.array([4, 5, 6])

# use concatenate to add the new elements to the original array
arr = np.concatenate((arr, new_arr))

# print the updated array
print(arr)

Output:

[1 2 3 4 5 6]

Alternatively, you can use the numpy.append() method to add a single element to the end of an array:

import numpy as np

# create an initial array
arr = np.array([1, 2, 3])

# add a new element to the end of the array
arr = np.append(arr, 4)

# print the updated array
print(arr)

Output:

[1 2 3 4]