我有一个问题：
MyModel.query.filter(Mymodel.name.contains( a_string ))
我需要执行相同的查询，但使用否定（与运算符不同），但在SQLAlchemy文档。
有没有什么方法可以在不使用SQLAlchemy的sql部分的情况下做到这一点？？？
只需否定过滤器：
MyModel.query.filter(sqlalchemy.not_(Mymodel.name.contains( a_string )))
现在有一个notlike（）方法。在文档中找不到它，但它存在！
MyModel.query.filter(Mymodel.name.notlike( %a_string% ))
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