input: Write a function to generate a random password of length 8, which consists of alphanumeric characters and at least one special character. If the generated password does not contain any special character, the function should regenerate the password.
  assert generate_password() != generate_password()  # Different passwords are expected
  assert len(generate_password()) == 8
  assert any(char in string.punctuation for char in generate_password())
output: import random
  import string
  
  def generate_password():
      while True:
          password = ''.join(random.choices(string.ascii_letters + string.digits + string.punctuation, k=8))
          if any(char in string.punctuation for char in password):
              return password