def flatten(expr):
    return u''.join(list(text.flatten(expr, currentAttrs=text.AttributeSet())))
Show that user can check if the plan is free.
dataset/ETHPy150Open twisted/imaginary/imaginary/test/commandutils.py/flatten--crossover with--dataset/ETHPy150Open sigmavirus24/github3.py/tests/unit/test_users.py/TestPlan.test_is_free