class_docstr: Tracker for uploader progress and status.
class_docstr_tok: ["Tracker","for","uploader","progress","and","status","."]
docstr: Determine if any data has been uploaded under the tracker's watch.
code: def has_data(self):
      """Determine if any data has been uploaded under the tracker's watch."""
      return self._stats.has_data()
  
imports: import contextlib
  from datetime import datetime
  import sys
  import time
label_desc: Use image node_id 5 for calling the UploadTracker obj's underlying member method code with example usage: obj.has_data() and returns: self