PTA (daily question) 7-69 narcissus number

Enter two 3 Bit positive integer m,n, Output [m,n] All in the interval “ Narcissistic number ”. So-called “ Narcissistic number ” It means a 3 digit , The sum of the cubes of the numbers is equal to the number itself .

Input format :
Test data consists of multiple groups , Processing to the end of the file . Enter two... For each set of tests 3 Bit positive integer m,n（100≤m<n≤999）.

Output format :
For each group of tests , if [m,n] If there is no daffodil number in the interval, it will be output “none”（ Quotation marks do not have to be output ）, Otherwise, the number of all daffodils in the interval is output line by line , For the format of each line of output, please refer to the output sample .

sample input :

100 150
100 200

sample output :

none
153=1*1*1+5*5*5+3*3*3

Code ：

try:
    while True:
        m, n = map(int, input().split())
        flag = 1
        for i in range(m, n+1):
            a, b, c = [int(x) for x in list(str(i))]  #  Use this , This is it. python The power of 
            # a = i//100
            # b = i//10%10
            # c= i%10
            if a*a*a + b*b*b + c*c*c == i:
                flag = 0
                print(f'{
      i}={
      a}*{
      a}*{
      a}+{
      b}*{
      b}*{
      b}+{
      c}*{
      c}*{
      c}')
        if flag:
            print('none')
except EOFError:
    pass