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py/objobject: Add object.__delattr__ function. 

Similar to object.__setattr__.
This commit is contained in:
Yonatan Goldschmidt 2019-12-10 12:05:22 +02:00 committed by Damien George
parent 07ccb5588c
commit 42e45bd694
2 changed files with 43 additions and 0 deletions
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18
py/objobject.c
View File

@ -77,6 +77,23 @@ STATIC mp_obj_t object___setattr__(mp_obj_t self_in, mp_obj_t attr, mp_obj_t val
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(object___setattr___obj, object___setattr__);
STATIC mp_obj_t object___delattr__(mp_obj_t self_in, mp_obj_t attr) {
if (!mp_obj_is_instance_type(mp_obj_get_type(MP_OBJ_TO_PTR(self_in)))) {
mp_raise_TypeError("arg must be user-type");
}
if (!mp_obj_is_str(attr)) {
mp_raise_TypeError(NULL);
}
mp_obj_instance_t *self = MP_OBJ_TO_PTR(self_in);
if (mp_map_lookup(&self->members, attr, MP_MAP_LOOKUP_REMOVE_IF_FOUND) == NULL) {
mp_raise_msg(&mp_type_AttributeError, "no such attribute");
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(object___delattr___obj, object___delattr__);
#endif
STATIC const mp_rom_map_elem_t object_locals_dict_table[] = {
@ -88,6 +105,7 @@ STATIC const mp_rom_map_elem_t object_locals_dict_table[] = {
#endif
#if MICROPY_PY_DELATTR_SETATTR
{ MP_ROM_QSTR(MP_QSTR___setattr__), MP_ROM_PTR(&object___setattr___obj) },
{ MP_ROM_QSTR(MP_QSTR___delattr__), MP_ROM_PTR(&object___delattr___obj) },
#endif
};

25
tests/basics/class_delattr_setattr.py
View File

@ -69,6 +69,9 @@ class C:
def __setattr__(self, attr, value):
print(attr, "=", value)
def __delattr__(self, attr):
print("del", attr)
c = C()
c.a = 5
try:
@ -86,3 +89,25 @@ try:
object.__setattr__(c, 5, 5)
except TypeError:
print("TypeError")
# test object.__delattr__
del c.a
print(c.a)
object.__delattr__(c, "a")
try:
print(c.a)
except AttributeError:
print("AttributeError")
super(C, c).__delattr__("b")
try:
print(c.b)
except AttributeError:
print("AttributeError")
try:
object.__delattr__(c, "c")
except AttributeError:
print("AttributeError")