parameters: ()
return_statement: return nullenv
docstring: Use singleton pattern for Null Environments.
docstring_summary: Use singleton pattern for Null Environments.
docstring_tokens: Use singleton pattern for Null Environments .
function: def get_NullEnvironment():
      """Use singleton pattern for Null Environments."""
      global nullenv
  
      if nullenv is None:
          nullenv = NullEnvironment()
      return nullenv
function_tokens: def get_NullEnvironment ( ) : global nullenv if nullenv is None : nullenv = NullEnvironment ( ) return nullenv