parameters: (self)
return_statement: return (f'The property {self.data_name} is unavailable until the '
                  'simulation runs for 0 or more steps.')
docstring: Returns the error message.
docstring_summary: Returns the error message.
docstring_tokens: Returns the error message .
function: def __str__(self):
          """Returns the error message."""
          return (f'The property {self.data_name} is unavailable until the '
                  'simulation runs for 0 or more steps.')
function_tokens: def __str__ ( self ) : return ( f'The property {self.data_name} is unavailable until the ' 'simulation runs for 0 or more steps.' )