human
Solve the following python programming problem given the following code:
@memoized
def get_course_outline_block_tree(request, course_id):
assistant
#Here is the Python code you requested.

    """Returns the root block of the course outline, with children as blocks.
    """
    def populate_children(block, all_blocks):
        '\n                                Replace    each    child    id    with    the    full    block    for    the    child.\n\n                                Given    a    block,    replaces    each    id    in    its    children    array    with    the    full\n                                representation    of    that    child,    which    will    be    looked    up    by    id    in    the\n                                passed    all_blocks    dict.    Recursively    do    the    same    replacement    for    children\n                                of    those    children.\n                                '
        children = block.get('children', [])
        for i in range(len(children)):
            child_id = block['children'][i]
            child_detail = populate_children(all_blocks[child_id], all_blocks)
            block['children'][i] = child_detail
        return block
    def set_last_accessed_default(block):
        '\n                                Set    default    of    False    for    last_accessed    on    all    blocks.\n                                '
        block['last_accessed'] = False
        for child in block.get('children', []):
            set_last_accessed_default(child)
    def mark_last_accessed(user, course_key, block):
        '\n                                Recursively    marks    the    branch    to    the    last    accessed    block.\n                                '
        block_key = block.serializer.instance
        student_module_dict = get_student_module_as_dict(user, course_key, block_key)
        last_accessed_child_position = student_module_dict.get('position')
        if (last_accessed_child_position and block.get('children')):
            block['last_accessed'] = True
            if (last_accessed_child_position <= len(block['children'])):
                last_accessed_child_block = block['children'][(last_accessed_child_position - 1)]
                last_accessed_child_block['last_accessed'] =...