def get_duplicates(lst):
    return


def has_duplicates(lst):
    return


def join_elements_with(glue, lst):
    return


def fill(size, fill_value=0):
    return


def random_choose(lst):
    return


def random_fill(min_val, max_val, list_length):
    return


def stringify_elements(lst):
    return


def mean(lst):
    return

