用python编程，初学者不太懂

number = input (请输入一个四位数:”)
one =( int ( number [ o ])+5)%10
two =( int ( number [1])+5)%10
three =( int ( number [2])+5)%10
four =( int ( number [3])+5)%10
one , three= three , one
two ,four= four , two
print ( one *1000+ two *100+ three *10+ four )