动态创建对象的Doctest

def get_session(db_name, verbose, test):
"""Returns current DB session from SQLAlchemy pool.

>>> get_session('Mmusc20090126', False, True)
<sqlalchemy.orm.session.Session object at 0xfb5ff0>

"""
if test:
    engine = create_engine('sqlite:///:memory:', echo=verbose)
    log_load.debug('DB in RAM.')
else:
    engine = create_engine('sqlite:///' + 'DB/' + db_name + '.db', echo=verbose)
    log_load.debug('DB stored in file: %s' % 'DB/' + db_name + '.db')

# Create TABLES: Structures, Interactions, Interactors, PDB_UniProt, UniProtSeq
meta.create_all(engine)

Session = sessionmaker(bind=engine)
session = Session()

return session