code: def __enter__(self) -> "BatchProgressBar":
      self._progress.start()
      return self
  
imports: from typing import Optional, Callable, Tuple, List
  from rich import filesize
  from rich.progress import MofNCompleteColumn, BarColumn, TextColumn, TimeRemainingColumn, TimeElapsedColumn, Progress, ProgressColumn, TaskProgressColumn, Task
  from rich.text import Text
label_desc: Use image node_id 3 for calling the BatchProgressBar obj's underlying member method code with example usage: obj.__enter__() and returns: self