程序重复执行三次后出现响应异常：附Python赌博游戏完整代码

Hey Patrick, let's break down why your script starts acting wonky after three executions and fix those issues for good.

First, Let's Identify the Root Causes #

From looking at your code, there are a few key issues that are causing the "response异常" (unexpected behavior) you're seeing:

1. Floating-Point Precision Chaos #

You're using a float to track currency, and 0.2 is a value that can't be represented perfectly in binary floating-point. After three deductions of 0.2, your currency variable won't be a clean 4.4 — it'll be something like 4.399999999999999. This tiny error can throw off logic checks later, making the program behave unpredictably.

2. No Handling for Invalid Inputs #

If you type anything other than an uppercase Y, the script just loops back to the input prompt without any feedback. So if you accidentally type y (lowercase) or yes, it looks like the program is frozen — that's a common "unresponsive" trigger.

3. No Exit Path When You Choose to Stop #

When you input N, the script doesn't break out of the while loop. It just keeps asking you to gamble forever, which definitely feels like an error.

Here's the Fixed Version of Your Code #

I've addressed all the above issues and cleaned up the code a bit for readability:

from random import randint

# Track currency in cents (integers!) to avoid floating-point errors
# 5.0 USD = 500 cents
currency = 500

while currency > 0:
    # Normalize input: strip spaces + convert to uppercase
    start = input("Do you wish to gamble? Y/N ").strip().upper()
    
    if start == "Y":
        # Deduct 20 cents (0.2 USD) for playing
        currency -= 20
        # Roll three dice in one clean line
        dice_rolls = [randint(1, 6) for _ in range(3)]
        # Print each roll
        for roll in dice_rolls:
            print(roll)
        # Check for duplicates using a set (fewer elements = duplicates exist)
        if len(set(dice_rolls)) < 3:
            # Add 100 cents (1.0 USD) for winning
            currency += 100
            print("You win...")
        # Show current balance in USD for clarity
        print(f"Current balance: {currency / 100:.2f} USD")
    
    elif start == "N":
        # Exit the loop and show final balance when user quits
        print(f"Thanks for playing! Final balance: {currency / 100:.2f} USD")
        break
    
    else:
        # Tell user they entered something invalid instead of silent looping
        print("Oops, invalid input! Please enter Y or N.")

What Changed & Why? #

• Fixed floating-point errors: By using integers to track cents instead of floats for dollars, we eliminate all precision issues. We only convert back to dollars when displaying the balance.
• Input robustness: .strip().upper() ensures the script recognizes y, Y, Y, etc., and gives clear feedback for invalid inputs.
• Proper exit logic: Typing N now ends the program gracefully instead of looping infinitely.
• Cleaner code: Used list comprehensions for dice rolls and a set to check duplicates — this makes the code easier to read and maintain.

内容的提问来源于stack exchange，提问作者Patrick Cake