code: def _get_main_file():
      if len(sys.argv) > 0:
          return sys.argv[0]
      return None
  
file_path: mlflow/mlflow/tracking/context/default_context.py
imports: import getpass
  import sys
  from mlflow.entities import SourceType
  from mlflow.tracking.context.abstract_context import RunContextProvider
  from mlflow.utils.credentials import read_mlflow_creds
  from mlflow.utils.mlflow_tags import MLFLOW_SOURCE_NAME, MLFLOW_SOURCE_TYPE, MLFLOW_USER
label_desc: Use image node_id 2 for calling a global function with example usage: _get_main_file() and returns: None, sys