def _base_fact(atom):
    if isinstance(atom, Not):
        return atom.arg
    else:
        return atom
Returns the namespace of this entity, a string or None.
dataset/ETHPy150Open sympy/sympy/sympy/core/facts.py/_base_fact--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/datastore.py/Entity.namespace