Type checking inside a C extension... doesn't throw exception on failure

[Jon Perez]

Jon Perez wrote:

> Andrew MacIntyre wrote:
> 
>> First rule of using the Python C API: _always_ check the return value of
>> API functions.
> 
> This only applies to API functions which return PyObject*, right?

...because it is not hard to find instances in the source code for
the modules that come with Python where, for example, PyTuple_SetItem()'s
return value is not checked for.