from random import randint as rand


def randbool(r, mxr):
    t = rand(0, mxr)
    return (t <= r)

def randcell(w, h):
    tw = rand(0, w)
    th = rand(0, h)
    return (th, tw)

#
def randcell2(x, y, w, h):
    moves = [(-1, 0), (0, 1), (1, 0), 0, -1]
    t = rand(0, 3)
    dx, dy = moves[t][0], moves[t][1]
    return (x + dx, y + dy)