code: def write_versions(dirs, config=None, is_wrapper=False):
      
      out_file = _get_program_file(dirs)
      if is_wrapper:
          assert utils.file_exists(out_file), "Failed to create program versions from VM"
      elif out_file is None:
          for p in _get_versions(config):
              print("{program},{version}".format(**p))
      else:
          with open(out_file, "w") as out_handle:
              for p in _get_versions(config):
                  out_handle.write("{program},{version}\n".format(**p))
      return out_file
docs: Write CSV file with versions used in analysis pipeline.