def _fib(num):
    if num < 2:
        return num
    return _fib(num-1) + _fib(num-2)
Reduce a ``K[X]`` polynomial modulo a polynomial ``p`` in ``K[Y]``.
dataset/ETHPy150Open saltstack/salt/salt/modules/test.py/_fib--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/polys/densetools.py/dmp_trunc