The teacher told me I can get an additional A+...

PaperStoneAndScissors.py

import random

objects = ["Paper", "Scissors", "Stone", "Magma"]
playerScore = 0
aiScore = 0
magmaWasted = False

def whoWins(player):
  global playerScore
  global aiScore
  global magmaWasted
  player = player - 1
  if player == 3 and magmaWasted == False:
    print("You wasted your magma... So you win this round!")
    playerScore += 1
    magmaWasted = True
  elif player == 3 and magmaWasted == True:
    print("You tried to cheat... So we gave the AI some score!")
    aiScore += 1
  elif magmaWasted == False and player != 3:
    ai = random.randint(0,2)
    print("The player chooses " + objects[player] + "... And the AI chooses " + objects[ai] + "!")
    if ai == 0 and player == 2:
      print("So, the AI wins this round!")
      aiScore += 1
    elif ai == 2 and player == 0:
      print("So, the player wins this round!")
      playerScore += 1
    elif ai > player:
      print("So, the AI wins this round!")
      aiScore += 1
    elif ai < player:
      print("So, the player wins this round!")
      playerScore += 1
    else:
      print("The round ends in a draw!")
  if playerScore == 3:
    print("You got a score of 3... SO you get an extra Magma!")
    magmaWasted = False
  print("The player's score is " + str(playerScore) + ", and the AI's score is " + str(aiScore) + "\n")

print("Welcome to Paper, Scissors and Stone!\n\nRules:\n- There are five rounds\n- Paper is 1, Scissors is 2 and Stone is 3\n- You can choose Magma (4) that beats everything ONE time\n- You get an extra Magma if you get 3 wins\nGood luck!\n")
for i in range(1,6):
  print("So round " + str(i) + " begins...\n")
  player = int(input("Which one do you choose:"))
  whoWins(player)
if aiScore > playerScore:
  print("The AI wins the game!")
elif aiScore < playerScore:
  print("The player wins the game!")
else:
  print("The game ends in a draw!")