test_hyper.py 文件源码

def test_hyper_rewrite_sum():
    from sympy import RisingFactorial, factorial, Dummy, Sum
    _k = Dummy("k")
    assert replace_dummy(hyper((1, 2), (1, 3), x).rewrite(Sum), _k) == \
        Sum(x**_k / factorial(_k) * RisingFactorial(2, _k) /
            RisingFactorial(3, _k), (_k, 0, oo))

    assert hyper((1, 2, 3), (-1, 3), z).rewrite(Sum) == \
        hyper((1, 2, 3), (-1, 3), z)