擅长:python、mysql、java
<p>请在<a href="https://stackoverflow.com/questions/50980831/django-set-manual-arithmetic-formula-for-a-field/50980873#50980873">Django set manual arithmetic formula for a field</a>查看我的答案</p>
<p>您需要创建一个公式的meta,并具有在运行时执行它们的属性。在</p>
<pre><code>import operator
operator_map = {"+": operator.add, "-":operator.sub...}
class ModelB:
_operator <- while will store a raw operator
@property
def operator(self):
return operator_map[self._operator]
</code></pre>