input: Write a function to generate a random password with a minimum length of 8 characters, including at least one number and one special character.
  assert generate_password()!=None
  assert len(generate_password())==8
  assert any(char.isdigit() for char in generate_password())
  assert any(char in string.punctuation for char in generate_password())
  assert not any(char.isspace() 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.isdigit() for char in password) and any(char in string.punctuation for char in password):
              return password