defis_divisible_by_three(n):# 计算整数的数位和sum=digit_sum(n)# 判断数位和是否可以被3整除ifsum%3==0:returnTrueelse:returnFalse# 测试示例代码n=12345ifis_divisible_by_three(n):print("整数",n,"可以被3整除")else:print("整数",n,"不可以被3整除") 1. 2. 3. 4. 5. 6. 7. 8. 9...