"""
 another implementation of an indexed array

"""

def new_indexed_array(n):
    """ Return a new Indexed Array """
    return { '_size_': n }

def _index_is_valid(array, index):
    assert type(index) == type(1)
    assert 0 <= index < array['_size_']

def put(array, index, value):
    """ Assign a value to the array at index """
    _index_is_valid(array, index)
    array[index] = value

def get(array, index):
    _index_is_valid(array, index)
    return array[index]

array = new_indexed_array(4)
put(array, 0, 20)
put(array, 1, 10)
print("The 0'th element of the array is ", get(array, 0))
print("The array is ", array)