WHILE Mini Project — Rock, Paper, Scissors

The problem...

One round of Rock, Paper, Scissors means nothing. Best of three is a game. Best of however many you want — that's a real match.

You need a loop that runs a set number of rounds, tracks the score, and declares a winner at the end.

The idea!

The user decides how many rounds. while counts them down. random plays for the computer. The score updates after every round. At the end — the verdict.

The rules

• Rock beats Scissors
• Scissors beats Paper
• Paper beats Rock
• Same choice — draw

The solution

import random

choices = "rock paper scissors".split()
rounds = int(input("How many rounds? "))

player_score = 0
computer_score = 0
current_round = 0

while current_round < rounds:
    current_round += 1
    print(f"\nRound {current_round} of {rounds}")

    player = input("rock, paper or scissors? ").lower()
    if player not in choices:
        print("Invalid choice. Round skipped.")
        continue

    computer = random.choice(choices)
    print(f"Computer chose: {computer}")

    if player == computer:
        print("Draw.")
    elif (player == "rock" and computer == "scissors") or \
         (player == "scissors" and computer == "paper") or \
         (player == "paper" and computer == "rock"):
        print("You win this round.")
        player_score += 1
    else:
        print("Computer wins this round.")
        computer_score += 1

print(f"\nFinal score — You: {player_score} | Computer: {computer_score}")

if player_score > computer_score:
    print("You win the match!")
elif computer_score > player_score:
    print("Computer wins the match.")
else:
    print("It's a draw.")

Test it

# How many rounds? 3
# Round 1 of 3
# rock, paper or scissors? rock
# Computer chose: scissors
# You win this round.
# Round 2 of 3
# rock, paper or scissors? paper
# Computer chose: paper
# Draw.
# Round 3 of 3
# rock, paper or scissors? scissors
# Computer chose: rock
# Computer wins this round.
# Final score — You: 1 | Computer: 1
# It's a draw.

What's really happening

while counts the rounds. random.choice() picks for the computer. continue skips invalid input without wasting a round — it just asks again next iteration. Two score counters track the match. After the loop — the verdict.

Go further

• Add a "best of" message at the start — "Best of 5"
• Stop early if one player can't be caught — if the lead is too big to close
• Track draws separately and show them in the final score

What you should understand now

• while counts rounds — you control how many
• random.choice() picks from a sequence — perfect for computer moves
• continue skips invalid input cleanly — no round wasted
• Multiple counters — player score, computer score, current round — all work together