how to write a program to check amstrong number

Answer 1

Here It Is

num = int(input("Enter the number : "))
order = len(str(num))
sum = 0

temp = num
while temp > 0:
digit = temp % 10
sum += digit ** order
temp //= 10

if num == sum:
print (num, "is an Armstrong number")
else:
print (num, "is not an Armstrong number")

If you don't understand it ... I will explain it to you in detail

Answer 2

Taking a quick peek online at how Armstrong/Narcissistic numbers are generated:
http://www.cs.mtu.edu/~shene/COURSES/cs201/NOTES/chap04/arms.html

Perhaps you want to know how to split a number into digits? (everything else you need to know is taught in the app I think)

>>> string_int="31427"

>>> list(string_int)
['3', '1', '4', '2', '7']