docs: def issuetypes(accountable, project_key):
      """
      List all issue types. Optional parameter to list issue types by a given
      project.
      """
      projects = accountable.issue_types(project_key)
      headers = sorted(['id', 'name', 'description'])
      rows = []
      for key, issue_types in sorted(projects.items()):
          for issue_type in issue_types:
              rows.append(
                  [key] + [v for k, v in sorted(issue_type.items())
                           if k in headers]
              )
      rows.insert(0, ['project_key'] + headers)
      print_table(SingleTable(rows))