code: def find_default_container(builder,                  # type: HasReqsHints
                             default_container=None,   # type: Text
                             use_biocontainers=None,  # type: bool
                            ):  # type: (...) -> Optional[Text]
      
      if not default_container and use_biocontainers:
          default_container = get_container_from_software_requirements(
              use_biocontainers, builder)
      return default_container
docs: Default finder for default containers.