Recursively convert all elements and all elements of all sublists of a list
    to a specified type and return the new list.

def convert_type_list_elements(
    list_object  = None,
    element_type = str
    ):
    """
    Recursively convert all elements and all elements of all sublists of a list
    to a specified type and return the new list.
    """
    if element_type is str:
        return [str(element) if not isinstance(element, list) else convert_type_list_elements(
            list_object  = element,
            element_type = str
        ) for element in list_object]