Is there a way to access the parameters to the Column() call used to set up a 
database table when given either an instance field or class field?

For example:

class MyClass(Base):
        ...
        f1 = Column(Integer, nullable=False, info={'min':0})
        ...

If I have MyClass.f1 or my_class.f1 (where my_class is an instance of MyClass) 
is there a way to get nullable or info?

The only way I've come up with so far is to match the __table__.columns 
elements on the name parameter.

Thanks,
Mark

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