input: Write a function to check if a given number is an Armstrong number.
  def is_armstrong_number(num):
    order = len(str(num))
    sum = 0
    temp = num
    while temp > 0:
      digit = temp % 10
      sum += digit ** order
      temp //= 10
    if num == sum:
      return True  
    else:
      return False
  
  assert is_armstrong_number(153) == True
  assert is_armstrong_number(370) == True
  assert is_armstrong_number(9474) == True
  assert is_armstrong_number(123) == False
  assert is_armstrong_number(371) == True
output: def is_armstrong_number(num):
    order = len(str(num))
    sum = 0
    temp = num
    while temp > 0:
      digit = temp % 10
      sum += digit ** order
      temp //= 10
    if num == sum:
      return True  
    else:
      return False