如何将浮点值舍入到最接近的5的倍数

def round_to_nearest_5(number):
    is_negative = False
    if number < 0:
        is_negative = True
        number = abs(number)
    
    quotient = int(number / 5)
    closest_multiple = quotient * 5
    
    if closest_multiple > number:
        rounded_number = closest_multiple - 5
    else:
        rounded_number = closest_multiple + 5
    
    if is_negative:
        rounded_number = -rounded_number
    
    return rounded_number