Find the symbol of the specified name inside the module or raise an
        exception.

def _find_symbol(self, module, name, fallback=None):
        """
        Find the symbol of the specified name inside the module or raise an
        exception.
        """
        if not hasattr(module, name) and fallback:
            return self._find_symbol(module, fallback, None)
        return getattr(module, name)