num = 1223
num_str = str(num)
def paixu(i):
if i == -1:
return ''
else:
return num_str[i]+paixu(i-1)
new_num = paixu(len(num_str)-1)
print(new_num)
if num == int(new_num):
print('num是回文数')
else:
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print('num不是回文数')