如何为类似于django模型/字段的动态字段指定类型？

class DynamicFieldMeta(type):
    def __new__(cls, name, bases, attrs):
        # 获取所有动态字段
        dynamic_fields = {k: v for k, v in attrs.items() if isinstance(v, DynamicField)}
        
        # 根据字段类型指定字段类型
        for field_name, field in dynamic_fields.items():
            field_type = field.get_field_type()
            attrs[field_name] = field_type
        
        return super().__new__(cls, name, bases, attrs)


class DynamicField:
    def __init__(self, field_type):
        self.field_type = field_type
    
    def get_field_type(self):
        return self.field_type


class MyModel(metaclass=DynamicFieldMeta):
    name = DynamicField(str)
    age = DynamicField(int)