[Python-checkins] cpython: Migrate str.expandtabs to the new API

["Martin v. Löwis"]

>    Migrate str.expandtabs to the new API

This needs

    if (PyUnicode_READY(self) == -1)
        return NULL;

right after the ParseTuple call. In most cases, the
check will be a noop. But if it's not, omitting it will
make expandtabs have no effect, since the string length
will be 0 (in a debug build, you also get an assertion
failure).

Regards,
Martin