def find(self, id):
        for item in self._items:
            if item.id == id:
                return item
        else:
            return None
Check namespace packages' __init__ for declare_namespace
dataset/ETHPy150Open enthought/pyface/pyface/action/group.py/Group.find--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/setuptools-0.6c11/setuptools/command/build_py.py/build_py.check_package