The code generated for the Py_UNICODE converter (and derived converter LPCWSTR) looks like:

constPy_UNICODE*name;...if (!_PyArg_ParseXXX(...,name, ...)) {    gotoexit;}...exit:PyMem_Free((void*)name);

If parsing fails,PyMem_Free() is called for uninitialized variable.

It is the only converter with non-trivial cleanup which does not have a mandatory initializer.