Magento在安装脚本中添加产品属性

I want to add attribute to product price in Magento by install script. It should be a select field displayed in the Prices group and consists of two values - Yes and No. But I faced with a problem: my code doesn't work. Despite long looking through my code, the problem still doesn't fixed. Could you help me with this issue? Here is my code:I want to add attribute to product price in Mag