def get_values_from_tuple_list(list_of_tuples):
    """Convert a list of tuples to a set of the tuple values.

    :param list_of_tuples: List of tuples.
    :type list_of_tuples: list
    :returns: Set of values from all tuples in the list.
    :rtype: set
    """
    output_set = set()
    for tup in list_of_tuples:
        output_set.add(tup[0])
    return output_set
