avoid naming cython attributes __module__

src/sage/misc/cachefunc.pxd

@@ -5,7 +5,7 @@ cpdef cache_key(o)
 
 cdef class CachedFunction():
     cdef public str __name__
-    cdef public str __module__
+    cdef public str __cached_module__
     cdef ArgumentFixer _argument_fixer
     cdef public f
     cdef public cache  # not always of type <dict>
@@ -20,7 +20,7 @@ cdef class CachedFunction():
 cdef class CachedMethod():
     cdef str _cache_name
     cdef public str __name__
-    cdef public str __module__
+    cdef public str __cached_module__
     cdef CachedFunction _cachedfunc
     cdef Py_ssize_t nargs
     cpdef _get_instance_cache(self, inst)

src/sage/misc/cachefunc.pyx

@@ -761,13 +761,17 @@ cdef class CachedFunction():
         else:
             self.__name__ = f.__name__
         try:
-            self.__module__ = f.__module__
+            self.__cached_module__ = f.__module__
         except AttributeError:
-            self.__module__ = f.__objclass__.__module__
+            self.__cached_module__ = f.__objclass__.__module__
         if argument_fixer is not None: # it is None unless the argument fixer
                                        # was known previously. See #15038.
             self._argument_fixer = argument_fixer
 
+    @property
+    def __module__(self):
+        return self.__cached_module__
+
     cdef get_key_args_kwds(self, tuple args, dict kwds):
         """
         Return the key in the cache to be used when ``args`` and
@@ -828,7 +832,7 @@ cdef class CachedFunction():
             sage: loads(dumps(hilbert_class_polynomial)) is hilbert_class_polynomial  #indirect doctest
             True
         """
-        return _cached_function_unpickle, (self.__module__, self.__name__, self.cache)
+        return _cached_function_unpickle, (self.__cached_module__, self.__name__, self.cache)
 
     #########
     ## Introspection
@@ -2675,7 +2679,11 @@ cdef class CachedMethod():
         self._cache_name = '_cache__' + (name or f.__name__)
         self._cachedfunc = CachedFunction(f, classmethod=True, name=name, key=key, do_pickle=do_pickle)
         self.__name__ = self._cachedfunc.__name__
-        self.__module__ = self._cachedfunc.__module__
+        self.__cached_module__ = self._cachedfunc.__module__
+
+    @property
+    def __module__(self):
+        return self.__cached_module__
 
     def __call__(self, inst, *args, **kwds):
         """