在Python请求中停止文件下载

import requests
import os

def download_file(url, save_path):
    response = requests.get(url, stream=True)
    stop_flag = False

    with open(save_path, 'wb') as file:
        for chunk in response.iter_content(chunk_size=1024):
            if chunk:
                file.write(chunk)
            if stop_flag:
                break

import threading

def listen_keyboard():
    global stop_flag
    while True:
        key = input()
        if key == 'q':
            stop_flag = True
            break

# 启动监听线程
keyboard_thread = threading.Thread(target=listen_keyboard)
keyboard_thread.start()

stop_flag = False
download_file('http://example.com/file.txt', 'path/to/save/file.txt')