[sqlalchemy] Many to many relationship with a composite key

[Christian]

Let's say I have the following model:

class Molecule(Base):
   db = Column(Integer, primary_key=True)
   id = Column(Integer, primary_key=True)
   data = Column(Integer)
class Atom(Base):
   id = Column(Integer, primary_key=True)
   weight = Column(Integer)

And I want to establish a *many-to-many* relationship between Molecule and 
Atom, what would be the best way to do it? Notice that the *primary key* of 
Molecule is *composite*.

Thanks

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