使用 `dp.get_precision('xxx')` 来定义浮点数字段的预设数字精度已经淘汰了
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在V13以前，我们可以用下面的方法来为浮点数字段设置预设的数字精度：
import odoo.addons.decimal_precision as dp xxx = fields.Float(digits=dp.get_precision("Account"))这个定义对用户很友好，这表示
xxx字段可以使用一个叫Account的浮点数的小数点位数的定义。如果用户对xxx字段的精度不满意，就可以找到Account这个预设精度，改变精度值，xxx字段的精度也相应改变了。没有这个设计，改变浮点数精度必须依赖程序员修改代码。V13把目前的这个定义方式淘汰了，变得更加简单：
xxx = fields.Float(digits="Account")注意没有了
import, 和dp.get_precision
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