code: def _EvaluateExpressions(self, frame):
      
      return [self._FormatExpression(frame, expression) for expression in
              self._definition.get('expressions') or []]
docs: Evaluates watched expressions into a string form.
  
      If expression evaluation fails, the error message is used as evaluated
      expression string.
  
      Args:
        frame: Python stack frame of breakpoint hit.
  
      Returns:
        Array of strings where each string corresponds to the breakpoint
        expression with the same index.