def _freeze(self):
        object.__setattr__(self, "__frozen", True)

    # prevent adding any attribute via s.xxx.new_attribute = ...
Just like 'imp.find_module()', but with package support
dataset/ETHPy150Open pydata/pandas/pandas/core/base.py/NoNewAttributesMixin._freeze--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/setuptools-0.6c11/setuptools/depends.py/find_module