input: 
  import random
  import string
  
  def generate_password():
      """
      Generates a random password with 8 characters, including numbers, letters, and special characters.
      
      >>> generate_password()
      'A1b!2c#D'
      """
      password_characters = string.ascii_letters + string.digits + string.punctuation
      password = ''.join(random.choice(password_characters) for _ in range(8))
      return password
  
  # Example usage
  print(generate_password())
  
output:     password_characters = string.ascii_letters + string.digits + string.punctuation
      password = ''.join(random.choice(password_characters) for _ in range(8))
      return password