input: Write a function to simulate a rock-paper-scissors game between two players. The function should take two inputs representing the choices of Player 1 and Player 2. It should return a string indicating whether it is a draw, or which player wins based on predefined rules.
  assert play_game('rock', 'scissors') == 'Player 1 wins!'
  assert play_game('scissors', 'rock') == 'Player 2 wins!'
  assert play_game('paper', 'paper') == 'It is a draw!'
  assert play_game('scissors', 'paper') == 'Player 1 wins!'
  assert play_game('rock', 'paper') == 'Player 2 wins!'
output: def play_game(player1, player2):
      if player1 == player2:
          return 'It is a draw!'
      elif (player1 == 'rock' and player2 == 'scissors') or (player1 == 'scissors' and player2 == 'paper') or (player1 == 'paper' and player2 == 'rock'):
          return 'Player 1 wins!'
      else:
          return 'Player 2 wins!'