py/objtype: Add type.__bases__ attribute.
Enabled as part of MICROPY_CPYTHON_COMPAT.
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py/objtype.c
15
py/objtype.c
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@ -1014,6 +1014,21 @@ STATIC void type_attr(mp_obj_t self_in, qstr attr, mp_obj_t *dest) {
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dest[0] = MP_OBJ_NEW_QSTR(self->name);
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dest[0] = MP_OBJ_NEW_QSTR(self->name);
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return;
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return;
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}
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}
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if (attr == MP_QSTR___bases__) {
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if (self == &mp_type_object) {
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dest[0] = mp_const_empty_tuple;
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return;
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}
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mp_obj_t parent_obj = self->parent ? MP_OBJ_FROM_PTR(self->parent) : MP_OBJ_FROM_PTR(&mp_type_object);
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#if MICROPY_MULTIPLE_INHERITANCE
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if (mp_obj_is_type(parent_obj, &mp_type_tuple)) {
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dest[0] = parent_obj;
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return;
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}
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#endif
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dest[0] = mp_obj_new_tuple(1, &parent_obj);
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return;
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}
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#endif
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#endif
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struct class_lookup_data lookup = {
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struct class_lookup_data lookup = {
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.obj = (mp_obj_instance_t*)self,
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.obj = (mp_obj_instance_t*)self,
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@ -0,0 +1,45 @@
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# test for type.__bases__ implementation
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if not hasattr(object, '__bases__'):
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print("SKIP")
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raise SystemExit
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class A:
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pass
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class B(object):
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pass
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class C(B):
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pass
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class D(C, A):
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pass
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# Check the attribute exists
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print(hasattr(A, '__bases__'))
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print(hasattr(B, '__bases__'))
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print(hasattr(C, '__bases__'))
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print(hasattr(D, '__bases__'))
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# Check it is always a tuple
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print(type(A.__bases__) == tuple)
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print(type(B.__bases__) == tuple)
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print(type(C.__bases__) == tuple)
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print(type(D.__bases__) == tuple)
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# Check size
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print(len(A.__bases__) == 1)
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print(len(B.__bases__) == 1)
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print(len(C.__bases__) == 1)
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print(len(D.__bases__) == 2)
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# Check values
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print(A.__bases__[0] == object)
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print(B.__bases__[0] == object)
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print(C.__bases__[0] == B)
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print(D.__bases__[0] == C)
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print(D.__bases__[1] == A)
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# Object has an empty tuple
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print(object.__bases__ == tuple())
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