Ok, Thanks for all your help ,I have found a solution as shown below

class Course(Base):
    __tablename__ = 'Course'

    course_id       = Column(INTEGER())
    course_code  = Column(VARCHAR(length=4))

    The line below works.
    course_name =
column_property(select([func.CONCAT(course_code,course_num)]))

  How ever this next line doesn't work even thought the docs seem to
imply that it should work.
  course_name = column_property(course_code + course_num)

Cheers
Royce

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