回数是指从左向右读和从右向左读都是一样的数,例如12321
,909
。请利用filter()
筛选出回数:
def is_palindrome(n): n = str(n) length = len(n) i=0 while i < length // 2: if(n[i] != n[-i - 1]): return False i += 1 return True
测试数据
# output = filter(is_palindrome, range(1, 1000)) # print('1~1000:', list(output)) # if list(filter(is_palindrome, range(1, 200))) == [1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191]: # print('测试成功!') # else: # print('测试失败!')