int PyLong_IsPositive(PyObject *);
int PyLong_IsNegative(PyObject *);
int PyLong_IsZero(PyObject *);

They should be identical to existing private functions _PyLong_IsPositive(), _PyLong_IsNegative() and _PyLong_IsZero(), except that the argument is PyObject * instead of PyLongObject *.

The private functions are much more used in the CPython code than _PyLong_Sign (numbers are not accurate):

26 _PyLong_IsZero
 7 _PyLong_IsPositive
71 _PyLong_IsNegative
 8 _PyLong_Sign

Some of cases that use _PyLong_Sign could use _PyLong_IsNegative etc instead. It is expected that they will be more used in the user code too.

They are faster than PyLong_GetSign because they have less code.

They are also more convenient, because you do not need to introduce a variable for result and can use them in expression. For example:

if (PyLong_IsNegative(obj)) {

vs

int sign;
(void)PyLong_GetSign(obj, &sign);
if (sign < 0) {