API
ProgIter
ProgressManager
ProgIter.set_extra()
ProgIter.begin()
ProgIter.end()
ProgIter.step()
ProgIter.format_message()
ProgIter.format_message_parts()
ProgIter.ensure_newline()
ProgIter.display_message()
ProgressManager.progiter()
ProgressManager.update_info()
ProgressManager.start()
ProgressManager.stop()
ProgressManager.stopall()