Mapping a value to an interval

[Gribouillis]

Here is my last word

__version__ = '2023.03.17.2'

def rounding(precision, value):
    y = 0.5 if value >= 0 else -0.5
    return precision * int(y + value / precision)

def interval(coord, scale):
    s = scale // 2
    u = rounding(s, coord)
    return (u - s, u + s)

if __name__ == '__main__':
    from random import randint

    for i in range(10):
        x = randint(0, 1000000)
        print(x, interval(x, 5000))

Output:
589802 (587500, 592500)
886897 (885000, 890000)
775585 (772500, 777500)
17445 (15000, 20000)
794528 (792500, 797500)
57525 (55000, 60000)
466087 (462500, 467500)
501046 (497500, 502500)
906234 (902500, 907500)
744038 (742500, 747500)