code: def __init__(self, upload_stats, blob_bytes):
      self._upload_stats = upload_stats
      self._blob_bytes = blob_bytes
  
imports: import contextlib
  from datetime import datetime
  import sys
  import time
label_desc: Use image node_id 1 to create a new _BlobTracker object  with example: obj = _BlobTracker(upload_stats, blob_bytes)