python写的小脚本，通过更新host，更新 DNS来优化github的打开速度。

运行后，控制台闪一下就过去了，再次打开github就可以了。

Python源代码：

#!/usr/bin/env python3 # -*- coding: utf-8 -*- import os import sys import urllib.request import re import subprocess # 配置 HOSTS_URL = "https://raw.hellogithub.com/hosts" LOCAL_HOSTS_PATH = { "nt": r"C:WindowsSystem32driversetchosts", "posix": "/etc/hosts" }.get(os.name, "/etc/hosts") GITHUB_HOSTS_MARK = "# GitHub520 Host Start" END_MARK = "# GitHub520 Host End" def fetch_latest_hosts(): try: print("🌐 正在从 HelloGitHub 获取最新的 GitHub hosts...") with urllib.request.urlopen(HOSTS_URL, timeout=15) as resp: content = resp.read().decode('utf-8') return content except Exception as e: print(f"❌ 获取 hosts 失败: {e}") return None def read_current_hosts(): try: with open(LOCAL_HOSTS_PATH, 'r', encoding='utf-8') as f: return f.read() except Exception as e: print(f"❌ 无法读取 hosts 文件: {e}") return None def flush_dns_cache(): """跨平台刷新 DNS 缓存""" print("🔄 正在刷新 DNS 缓存...") try: if os.name == 'nt': # Windows subprocess.run(["ipconfig", "/flushdns"], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) elif sys.platform.startswith('darwin'): # macOS # macOS Monterey (12.0+) 及更高版本使用 'dscacheutil' 和 'sudo killall -HUP mDNSResponder' subprocess.run(["sudo", "dscacheutil", "-flushcache"], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) subprocess.run(["sudo", "killall", "-HUP", "mDNSResponder"], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) else: # Linux # 尝试多种可能的服务 services = ["systemd-resolved", "nscd", "dnsmasq", "NetworkManager"] flushed = False for svc in services: try: if svc == "systemd-resolved": subprocess.run(["sudo", "resolvectl", "flush-caches"], check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) elif svc == "nscd": subprocess.run(["sudo", "systemctl", "restart", "nscd"], stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) else: continue flushed = True break except (subprocess.CalledProcessError, FileNotFoundError): continue if not flushed: # 通用提示 print("ℹ️ 未检测到已知 DNS 服务，Linux 用户可手动运行 'sudo systemd-resolve --flush-caches'（如适用）") print("✅ DNS 缓存已刷新！") except Exception as e: print(f"⚠️ 刷新 DNS 缓存时出错（可忽略）: {e}") def write_hosts(new_content): try: with open(LOCAL_HOSTS_PATH, 'w', encoding='utf-8') as f: f.write(new_content) print("✅ hosts 文件已更新！") flush_dns_cache() # 自动刷新 DNS except PermissionError: print("❌ 权限不足！请以管理员（Windows）或 root（macOS/Linux）身份运行此脚本。") sys.exit(1) except Exception as e: print(f"❌ 写入 hosts 失败: {e}") sys.exit(1) def is_admin(): """跨平台判断是否具有管理员/root 权限""" if os.name == 'nt': try: import ctypes return ctypes.windll.shell32.IsUserAnAdmin() != 0 except: return False else: return os.geteuid() == 0 def main(): print("🚀 GitHub 访问加速工具（自动更新 hosts + 刷新 DNS）") if not is_admin(): if os.name == 'nt': print("🛑 错误：请右键选择“以管理员身份运行”此脚本。") else: print("🛑 错误：请使用 'sudo python3 github_hosts_accelerator.py' 运行。") sys.exit(1) new_hosts = fetch_latest_hosts() if not new_hosts: sys.exit(1) current_hosts = read_current_hosts() if current_hosts is None: sys.exit(1) # 移除旧的 GitHub520 区块（如果存在） pattern = re.compile(re.escape(GITHUB_HOSTS_MARK) + r".*?" + re.escape(END_MARK), re.DOTALL) cleaned_hosts = pattern.sub("", current_hosts).strip() # 确保末尾有换行 final_hosts = cleaned_hosts + "nn" + new_hosts.strip() + "n" write_hosts(final_hosts) print("n🎉 操作完成！现在可以尝试访问 GitHub 或执行 git clone 了。") print("n按任意键退出") if __name__ == "__main__": main()