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#Skeleton Program code for the AQA A Level Paper 1 Summer 2025 examination
#this code should be used in conjunction with the Preliminary Material
#written by the AQA Programmer Team
#developed in the Python 3.9 programming environment
import re
import random
import math
def Main():
NumbersAllowed = []
Targets = []
MaxNumberOfTargets = 20
MaxTarget = 0
MaxNumber = 0
TrainingGame = False
Choice = input("Enter y to play the training game, anything else to play a random game: ").lower()
print()
if Choice == "y":
MaxNumber = 1000
MaxTarget = 1000
TrainingGame = True
Targets = [-1, -1, -1, -1, -1, 23, 9, 140, 82, 121, 34, 45, 68, 75, 34, 23, 119, 43, 23, 119]
else:
MaxNumber = 10
MaxTarget = 50
Targets = CreateTargets(MaxNumberOfTargets, MaxTarget)
NumbersAllowed = FillNumbers(NumbersAllowed, TrainingGame, MaxNumber)
PlayGame(Targets, NumbersAllowed, TrainingGame, MaxTarget, MaxNumber)
input()
def PlayGame(Targets, NumbersAllowed, TrainingGame, MaxTarget, MaxNumber):
Score = 0
GameOver = False
while not GameOver:
DisplayState(Targets, NumbersAllowed, Score)
UserInput = input("Enter an expression: ")
print()
if CheckIfUserInputValid(UserInput):
UserInputInRPN = ConvertToRPN(UserInput)
if CheckNumbersUsedAreAllInNumbersAllowed(NumbersAllowed, UserInputInRPN, MaxNumber):
IsTarget, Score = CheckIfUserInputEvaluationIsATarget(Targets, UserInputInRPN, Score)
if IsTarget:
NumbersAllowed = RemoveNumbersUsed(UserInput, MaxNumber, NumbersAllowed)
NumbersAllowed = FillNumbers(NumbersAllowed, TrainingGame, MaxNumber)
Score -= 1
if Targets[0] != -1:
GameOver = True
else:
Targets = UpdateTargets(Targets, TrainingGame, MaxTarget)
print("Game over!")
DisplayScore(Score)
def CheckIfUserInputEvaluationIsATarget(Targets, UserInputInRPN, Score):
UserInputEvaluation = EvaluateRPN(UserInputInRPN)
UserInputEvaluationIsATarget = False
if UserInputEvaluation != -1:
for Count in range(0, len(Targets)):
if Targets[Count] == UserInputEvaluation:
Score += 2
Targets[Count] = -1
UserInputEvaluationIsATarget = True
return UserInputEvaluationIsATarget, Score
def RemoveNumbersUsed(UserInput, MaxNumber, NumbersAllowed):
UserInputInRPN = ConvertToRPN(UserInput)
for Item in UserInputInRPN:
if CheckValidNumber(Item, MaxNumber):
if int(Item) in NumbersAllowed:
NumbersAllowed.remove(int(Item))
return NumbersAllowed
def UpdateTargets(Targets, TrainingGame, MaxTarget):
for Count in range (0, len(Targets) - 1):
Targets[Count] = Targets[Count + 1]
Targets.pop()
if TrainingGame:
Targets.append(Targets[-1])
else:
Targets.append(GetTarget(MaxTarget))
return Targets
def CheckNumbersUsedAreAllInNumbersAllowed(NumbersAllowed, UserInputInRPN, MaxNumber):
Temp = []
for Item in NumbersAllowed:
Temp.append(Item)
for Item in UserInputInRPN:
if CheckValidNumber(Item, MaxNumber):
if int(Item) in Temp:
Temp.remove(int(Item))
else:
return False
return True
def CheckValidNumber(Item, MaxNumber):
if re.search("^[0-9]+$", Item) is not None:
ItemAsInteger = int(Item)
if ItemAsInteger > 0 and ItemAsInteger <= MaxNumber:
return True
return False
def DisplayState(Targets, NumbersAllowed, Score):
DisplayTargets(Targets)
DisplayNumbersAllowed(NumbersAllowed)
DisplayScore(Score)
def DisplayScore(Score):
print("Current score: " + str(Score))
print()
print()
def DisplayNumbersAllowed(NumbersAllowed):
print("Numbers available: ", end = '')
for N in NumbersAllowed:
print(str(N) + " ", end = '')
print()
print()
def DisplayTargets(Targets):
print("|", end = '')
for T in Targets:
if T == -1:
print(" ", end = '')
else:
print(T, end = '')
print("|", end = '')
print()
print()
def ConvertToRPN(UserInput):
Position = 0
Precedence = {"+": 2, "-": 2, "*": 4, "/": 4}
Operators = []
Operand, Position = GetNumberFromUserInput(UserInput, Position)
UserInputInRPN = []
UserInputInRPN.append(str(Operand))
Operators.append(UserInput[Position - 1])
while Position < len(UserInput):
Operand, Position = GetNumberFromUserInput(UserInput, Position)
UserInputInRPN.append(str(Operand))
if Position < len(UserInput):
CurrentOperator = UserInput[Position - 1]
while len(Operators) > 0 and Precedence[Operators[-1]] > Precedence[CurrentOperator]:
UserInputInRPN.append(Operators[-1])
Operators.pop()
if len(Operators) > 0 and Precedence[Operators[-1]] == Precedence[CurrentOperator]:
UserInputInRPN.append(Operators[-1])
Operators.pop()
Operators.append(CurrentOperator)
else:
while len(Operators) > 0:
UserInputInRPN.append(Operators[-1])
Operators.pop()
return UserInputInRPN
def EvaluateRPN(UserInputInRPN):
S = []
while len(UserInputInRPN) > 0:
while UserInputInRPN[0] not in ["+", "-", "*", "/"]:
S.append(UserInputInRPN[0])
UserInputInRPN.pop(0)
Num2 = float(S[-1])
S.pop()
Num1 = float(S[-1])
S.pop()
Result = 0.0
if UserInputInRPN[0] == "+":
Result = Num1 + Num2
elif UserInputInRPN[0] == "-":
Result = Num1 - Num2
elif UserInputInRPN[0] == "*":
Result = Num1 * Num2
elif UserInputInRPN[0] == "/":
Result = Num1 / Num2
UserInputInRPN.pop(0)
S.append(str(Result))
if float(S[0]) - math.floor(float(S[0])) == 0.0:
return math.floor(float(S[0]))
else:
return -1
def GetNumberFromUserInput(UserInput, Position):
Number = ""
MoreDigits = True
while MoreDigits:
if not(re.search("[0-9]", str(UserInput[Position])) is None):
Number += UserInput[Position]
else:
MoreDigits = False
Position += 1
if Position == len(UserInput):
MoreDigits = False
if Number == "":
return -1, Position
else:
return int(Number), Position
def CheckIfUserInputValid(UserInput):
if re.search("^([0-9]+[\\+\\-\\*\\/])+[0-9]+$", UserInput) is not None:
return True
else:
return False
def GetTarget(MaxTarget):
return random.randint(1, MaxTarget)
def GetNumber(MaxNumber):
return random.randint(1, MaxNumber)
def CreateTargets(SizeOfTargets, MaxTarget):
Targets = []
for Count in range(1, 6):
Targets.append(-1)
for Count in range(1, SizeOfTargets - 4):
Targets.append(GetTarget(MaxTarget))
return Targets
def FillNumbers(NumbersAllowed, TrainingGame, MaxNumber):
if TrainingGame:
return [2, 3, 2, 8, 512]
else:
while len(NumbersAllowed) < 5:
NumbersAllowed.append(GetNumber(MaxNumber))
return NumbersAllowed
if __name__ == "__main__":
Main()
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