np.append()

np.append(arr, value)

Returns a copy of arr with value appended at the end. This does not change arr unless you store the result in arr.

Input:

arr : array

The original array to which a value will be appended.

value : any type

The value to append to the array.

Returns:

A new array containing the elements of the original array followed by the appended value

Return Type:

array

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np.append(weight_arr, 2)

array([40. , 1.5 , 15. , 80. , 25. , 1. , 0.25, 10. , 2. ])