flask， models 文件夹内的数据库模型文件，引用失败，求解？

› Flask Framework

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我想在 theme.py 里引入 theme_product
使用 from . import theme_product 就可以
使用 from .theme_product import Theme_Product
就提示 cannot import name 'Theme_Product'
大写的 Theme_product 是 theme_product 的中的数据库类

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product，theme，是多对多关系，theme_product 是中间表

from . import theme_product
theme=db.relationship('Theme_Product',
                            foreign_keys=[theme_product.Theme_Product.product_id],
                            backref=db.backref('backProduct',lazy='joined'),
                            lazy='dynamic',
                            cascade='all,delete-orphan')

foreign_keys 那里告诉我 theme_product 没有 Theme_Product，这个 attribute
应该如何处理呢？

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import theme_product theme from