Return an array containing unique values from a given array.

array_unique.py

import numpy as np

def array_unique(arr):
    """
    Return an array containing unique values from a given array.

    Args:
        arr (list or numpy.ndarray): The input array.

    Returns:
        numpy.ndarray: An array containing unique values.

    Example:
        >>> arr = [1, 2, 3, 2, 4, 1, 5]
        >>> arr_unique = array_unique(arr)
        >>> print(arr_unique)
        [1, 2, 3, 4, 5]
    """
    return np.unique(np.array(arr))