input: Write a function to check if a given number is an Armstrong number. An Armstrong number (also known as a Narcissistic number) is a number that is equal to the sum of its own digits each raised to the power of the number of digits. Return True if the number is an Armstrong number, otherwise return False.
  
  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(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):   
      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