On 2017-05-13, Robert L. <No_spamming at noWhere_7073.org> wrote: [Schnipp] > def build_permutations things > if block_given? > things.permutation.select{|x| yield x} > else > things.permutation.to_a > end > end I fail to recognize the Python-version. -- Jan v/d Broek balglaas at dds.nl