[sqlalchemy] how to tell which columns are deferred in orm ?

[Jonathan Vanasco]

i'm trying to generate a list of non-deffered columns from an object 

referencing this example:

    class Book(Base):
        __tablename__ = 'book'

        book_id = Column(Integer, primary_key=True)
        title = Column(String(200), nullable=False)
        summary = Column(String(2000))
        excerpt = deferred(Column(Text))
        photo = deferred(Column(Binary))

how can I tell , when dealing with an instance of `Book()`, which columns 
are deferred or not ?

i tried inspecting virtually everything in:

    class_mapper(Book))

and looked over these multiple times:

    class_mapper(Book).mapped_table)
    class_mapper(Book).mapped_table.c)

but couldn't seem to find anything that works. 

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