如何在Python中检测上下箭头按键输入并处理HiLo游戏逻辑？

Hey there! Let's get those arrow keys working smoothly for your HiLo game. I noticed you already imported pygame—perfect, since it’s a reliable cross-platform way to handle keyboard events, and we can leverage that to fix your input issue. Let’s walk through the problems in your current code and build a working solution step by step.

First, let’s spot the key issues in your existing code: #

• Syntax errors: Lines like if and y > x are missing the actual key press check (you need to verify if the user pressed UP or DOWN first).
• Unused getch(): You call getch() but don’t save or check its return value to identify which key was pressed.
• Incorrect exit: exit is a function, so you need to call it as exit() to terminate the program properly.
• Redundant code: You repeat the same logic for generating new numbers and printing messages across all four conditionals—we can simplify this a lot.

Here’s the fixed version using pygame for arrow key handling: #

import random
import pygame

# Initialize pygame (required to capture keyboard events)
pygame.init()
# Create a minimal window (can be minimized; pygame needs a window to listen for events)
screen = pygame.display.set_mode((100, 100))
pygame.display.set_caption("HiLo Game")

name = input("Please enter your name: ")
print(f"Welcome {name}")
print(f"Okay {name}. We will now play a game called high or low. In order to play this game you have to be 18 or older")

age = int(input("Please enter your age: "))
if age < 18:
    print("You are not old enough to play.")
    pygame.quit()
    exit()
else:
    print(f"OK! You are {age}. You can play")

x = random.randint(1, 9)
y = random.randint(1, 9)
print(f"Your first number is {x}.")

counter = 0
truecounter = 0
falsecounter = 0

while counter < 10:  # Adjusted to run exactly 10 rounds
    print("Press UP for high and DOWN for low.")
    
    # Wait for a valid arrow key press
    user_choice = None
    while user_choice is None:
        for event in pygame.event.get():
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_UP:
                    user_choice = "high"
                elif event.key == pygame.K_DOWN:
                    user_choice = "low"
    
    # Check if the user's choice matches the actual number relationship
    correct = False
    if (user_choice == "high" and y > x) or (user_choice == "low" and y < x):
        correct = True
        truecounter += 1
        print(f"Your answer is correct! The other number was {y}")
    else:
        falsecounter += 1
        print(f"Ooops! You guessed wrong. The number was {y}")
    
    # Prepare for the next round
    x = random.randint(1, 9)
    y = random.randint(1, 9)
    print(f"Let's see if you can do it again. The number is {x}")
    
    counter += 1

# Clean up pygame and show final results
pygame.quit()
print(f"Congrats! You got {truecounter} out of 10!")

Key improvements explained: #

1. Pygame event handling: We use pygame.event.get() to listen for KEYDOWN events, which reliably detects UP (K_UP) and DOWN (K_DOWN) arrow keys across Windows, Mac, and Linux.
2. Simplified logic: Instead of four separate conditionals, we check if the user’s choice matches the actual number relationship in one line, then handle correct/incorrect outcomes once.
3. Proper cleanup: We call pygame.quit() before exiting to free up system resources, and use exit() correctly to terminate the program.
4. Exact 10 rounds: Changed the loop condition to counter <10 so the game runs exactly 10 times (your original <=10 would have run 11 rounds).

Alternative for Windows-only using msvcrt: #

If you prefer to stick with msvcrt instead of pygame, here’s how to detect arrow keys (note this only works on Windows):

import random
from msvcrt import getch

name = input("Please enter your name: ")
print(f"Welcome {name}")
print(f"Okay {name}. We will now play a game called high or low. In order to play this game you have to be 18 or older")

age = int(input("Please enter your age: "))
if age < 18:
    print("You are not old enough to play.")
    exit()
else:
    print(f"OK! You are {age}. You can play")

x = random.randint(1, 9)
y = random.randint(1, 9)
print(f"Your first number is {x}.")

counter = 0
truecounter = 0
falsecounter = 0

while counter < 10:
    print("Press UP for high and DOWN for low.")
    
    # Detect arrow keys: they send two bytes via getch()
    first_byte = getch()
    if first_byte in (b'\x00', b'\xe0'):
        second_byte = getch()
        if second_byte == b'H':  # UP arrow code
            user_choice = "high"
        elif second_byte == b'P':  # DOWN arrow code
            user_choice = "low"
        else:
            print("Please press UP or DOWN arrow!")
            continue
    else:
        print("Please press UP or DOWN arrow!")
        continue
    
    # Check correctness and update counters
    if (user_choice == "high" and y > x) or (user_choice == "low" and y < x):
        truecounter += 1
        print(f"Your answer is correct! The other number was {y}")
    else:
        falsecounter += 1
        print(f"Ooops! You guessed wrong. The number was {y}")
    
    # Prepare next round
    x = random.randint(1, 9)
    y = random.randint(1, 9)
    print(f"Let's see if you can do it again. The number is {x}")
    
    counter += 1

print(f"Congrats! You got {truecounter} out of 10!")

This works because arrow keys send two bytes when pressed with getch(): the first is either 0 or 224, and the second is H for UP, P for DOWN.

Either approach will get your arrow key input working as expected. Have fun playing your HiLo game!

内容的提问来源于stack exchange，提问作者Sedat Şıracı