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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _flush(self):
 """ Flush all caches Might be used after classes, methods or fields are added. """

        self.classes_names = None
        self.__cache_methods = None
        self.__cached_methods_idx = None
        self.__cache_fields = None

        # cache methods and fields as well, otherwise the decompiler is quite slow
        self.__cache_all_methods = None
        self.__cache_all_fields = None