<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def find_class(self, module, name):
 """ This override is here to help pickle find the modules that classes are defined in. It does three things: 1) remaps the "PackagedFunction" class from pyccc to the `source.py` module. 2) Remaps any classes created in the client's '__main__' to the `source.py` module 3) Creates on-the-fly modules to store any other classes present in source.py References: This is a modified version of the 2-only recipe from https://wiki.python.org/moin/UsingPickle/RenamingModules. It's been modified for 2/3 cross-compatibility """

        import pickle

        modname = self.RENAMETABLE.get(module, module)

        try:
            # can't use ``super`` here (not 2/3 compatible)
            klass = pickle.Unpickler.find_class(self, modname, name)

        except (ImportError, RuntimeError):
            definition = getattr(source, name)
            newmod = _makemod(modname)
            sys.modules[modname] = newmod
            setattr(newmod, name, definition)
            klass = pickle.Unpickler.find_class(self, newmod.__name__, name)
            klass.__module__ = module
        return klass