大一简单编程问题

一个偶数由两个素数相加def main(n): if n%2!=0: print('请输入偶数') i = [i for i in range(2,int(n0.5+1)) if i%n==0] j = [j for j in range(2,int(n0.5+1)) if j%n==0] if i+j==n: print(list(zip(i,j))) print(main(18))为什么不对呀