code: def tell(self):
      if self.closed:
          raise ValueError("I/O operation on closed file")
      return self.size_read
  
file_path: catboost/contrib/tools/python3/src/Lib/chunk.py
imports: import warnings
label_desc: Use image node_id 7 for calling the Chunk obj's underlying member method code with example usage: obj.tell() and returns: self