取 [start, end) 间的随机数，保留 accuracy 位小数

get_random.py

def get_random(start=0, end=1, accuracy=0):
    rnd = random.random() # [0, 1)
    rnd = (end - start) * rnd + start # [start, end)
    if accuracy == 0:
        return int(rnd)
    else:
        return round(rnd, accuracy)