Serhiy Storchaka added the comment:
Idiomatic code is
if (PyModule_AddObject(module, "name", create_new_object()) < 0)
goto error;
If you already have a reference and need to use it later:
obj = create_new_object();
... /* use obj */
Py_INCREF();
if (PyModule_AddObject(module, "name", create_new_object()) < 0)
goto error;
... /* use obj */
Py_DECREF(obj);
error:
Py_XDECREF(obj);
Many current code use above idioms, but it doesn't work as expected.
It is almost impossible to write correct code with current behavior. And
_decimal.c is not an exception, it has leaks.
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<http://bugs.python.org/issue26871>
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