input: def is_armstrong_number(num):   
      """Check if a given number is an Armstrong number.
      >>> is_armstrong_number(153)
      True
      >>> is_armstrong_number(9474)
      True
      >>> is_armstrong_number(123)
      False
      """
      n = len(str(num)) 
      # initialize sum  
      temp = num  
      sum_of_digits = 0
    
      # find sum of nth power of individual digits  
      while temp > 0:  
          digit = temp % 10  
          sum_of_digits += digit ** n  
          temp //= 10  
    
      # if num is equal to sum_of_digits then the number is an Armstrong number  
      if num == sum_of_digits:  
          return True 
    
      else: 
          return False
output:     n = len(str(num))
      temp = num
      sum_of_digits = 0
  
      while temp > 0:
          digit = temp % 10
          sum_of_digits += digit ** n
          temp //= 10
  
      return num == sum_of_digits