docstr: The name of the user who started the run, if available.
  
  Returns
  -------
  str, optional
      User name.
docstr_tok: ["The","name","of","the","user","who","started","the","run",",","if","available",".","Returns","--","--","--","-","str",",","optional","User","name","."]
code: def username(self) -> Optional[str]:
      """
      The name of the user who started the run, if available.
  
      Returns
      -------
      str, optional
          User name.
      """
      return self._username
  
imports: from collections import namedtuple
  import os
  from typing import Any, Optional
  from metaflow.metaflow_config import TEMPDIR
label_desc: Use image node_id 17 for calling the Current obj's underlying member method code with example usage: obj.username() and returns: self