class_docstr: Tracker for uploader progress and status.
class_docstr_tok: ["Tracker","for","uploader","progress","and","status","."]
code: def __init__(self, verbosity, one_shot=False):
      if verbosity not in self._SUPPORTED_VERBISITY_VALUES:
          raise ValueError(
              "Unsupported verbosity value %s (supported values: %s)"
              % (verbosity, self._SUPPORTED_VERBISITY_VALUES)
          )
      self._verbosity = verbosity
      self._stats = UploadStats()
      self._send_count = 0
      self._one_shot = one_shot
  
imports: import contextlib
  from datetime import datetime
  import sys
  import time
label_desc: Use image node_id 1 to create a new UploadTracker object  with example: obj = UploadTracker(verbosity, one_shot)