input: Write a function to determine if a given number is an Armstrong number. An Armstrong number is a number that is the sum of its own digits each raised to the power of the number of digits. The function should return True if the number is an Armstrong number, otherwise return False.
  
  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(9474) == True
  assert is_armstrong_number(1634) == True
  assert is_armstrong_number(123) == False
  assert is_armstrong_number(370) == 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