请改进以下代码 def webhook(): if request.method == 'GET': verify_token = request.headers.get('X-Gitlab-Token') if verify_token == WEBHOOK_VERIFY_TOKEN: return jsonify({'status': 'success'}), 200 else: return jsonify({'status': 'bad token'}), 401 elif request.method == 'POST': verify_token = request.headers.get('X-Gitlab-Token') if verify_token == WEBHOOK_VERIFY_TOKEN: print(request.get_json()) project_id = request.get_json().get('project').get('id') project_name = request.get_json().get('project').get('name') project_git_http_url = request.get_json().get('project').get('git_http_url') ref = request.get_json().get('ref') commit_id = request.get_json().get('commits')[0].get('id') modified = request.get_json().get('commits')[0].get('modified') # # 获取项目id,执行合并处理 retcode = subprocess.call('python3.5 {0} "{1}" "{2}" "{3}" "{4}" "{5}" '.format(pyfile, project_id, project_name, ref, commit_id, modified), shell=True) if retcode == 0: return jsonify({'status': 'success'}), 200 else: return jsonify({'status': 'error'}), 503 else: return jsonify({'status': 'bad token'}), 401 else: abort(400)

以下是改进后的代码，主要包括以下几个方面：

1. 增加注释和异常处理，提高代码可读性和健壮性。
2. 将重复代码封装成函数，减少代码量并提高可维护性。
3. 使用 f-string 格式化字符串，提高代码可读性。

改进后的代码如下：

from flask import Flask, request, jsonify, abort
import subprocess

app = Flask(__name__)

WEBHOOK_VERIFY_TOKEN = 'your_token_here'
pyfile = 'path/to/your/python/script.py'

def verify_token():
    """验证 token 是否正确"""
    token = request.headers.get('X-Gitlab-Token')
    if token != WEBHOOK_VERIFY_TOKEN:
        abort(401)

def handle_merge(project_id, project_name, ref, commit_id, modified):
    """执行合并处理"""
    retcode = subprocess.call(f'python3.5 {pyfile} "{project_id}" "{project_name}" "{ref}" "{commit_id}" "{modified}"', shell=True)
    if retcode != 0:
        abort(503)

@app.route('/', methods=['GET', 'POST'])
def webhook():
    if request.method == 'GET':
        verify_token()
        return jsonify({'status': 'success'}), 200
    elif request.method == 'POST':
        verify_token()
        data = request.get_json()
        project = data.get('project')
        commits = data.get('commits')
        if not all([project, commits]):
            abort(400)
        project_id, project_name, project_git_http_url = project.get('id'), project.get('name'), project.get('git_http_url')
        ref, commit_id, modified = commits[0].get('id'), commits[0].get('modified')
        handle_merge(project_id, project_name, ref, commit_id, modified)
        return jsonify({'status': 'success'}), 200
    else:
        abort(400)

需要注意的是，由于使用了 subprocess 执行命令，存在一定的安全风险，建议对命令参数进行校验和过滤。