input: Write a function to determine if a given number is an Armstrong number.
  def is_armstrong_number(num): 
      n = len(str(num)) 
      temp = num  
      sum_of_digits = 0
    
      while temp > 0:  
          digit = temp % 10  
          sum_of_digits += digit ** n  
          temp //= 10  
    
      if num == sum_of_digits:  
          return True 
    
      else: 
          return False
  assert is_armstrong_number(153)==True
  assert is_armstrong_number(9474)==True
  assert is_armstrong_number(123)==False
  assert is_armstrong_number(1634)==True
  assert is_armstrong_number(8208)==True
output: def is_armstrong_number(num): 
      n = len(str(num)) 
      temp = num  
      sum_of_digits = 0
    
      while temp > 0:  
          digit = temp % 10  
          sum_of_digits += digit ** n  
          temp //= 10  
    
      if num == sum_of_digits:  
          return True 
    
      else: 
          return False