parameters: (self, expression, var)
docstring: Throw an error saying we could not evaluate the given expression.
docstring_summary: Throw an error saying we could not evaluate the given expression.
docstring_tokens: Throw an error saying we could not evaluate the given expression .
function: def _error_evaluating_expression(self, expression, var):
          """Throw an error saying we could not evaluate the given expression."""
          self._error(
              'Invalid expression',
              'An error occurred while trying to evaluate the given '
              'expression.  It is likely that this expression is '
              'ill-formed, or that the variables it uses do not '
              'exist:\n\n%s\n\nDefined variables: %s' %
              (expression, ', '.join(sorted(var.keys()))))
function_tokens: def _error_evaluating_expression ( self , expression , var ) : self . _error ( 'Invalid expression' , 'An error occurred while trying to evaluate the given ' 'expression.  It is likely that this expression is ' 'ill-formed, or that the variables it uses do not ' 'exist:\n\n%s\n\nDefined variables: %s' % ( expression , ', ' . join ( sorted ( var . keys ( ) ) ) ) )