是否有任何好的短代码示例只是阅读新的Gmail邮件？

import os
import base64
import email
from google.oauth2.credentials import Credentials
from google_auth_oauthlib.flow import InstalledAppFlow
from googleapiclient.discovery import build

# 设置API访问范围
SCOPES = ['https://www.googleapis.com/auth/gmail.readonly']

def read_gmail():
    # 获取用户凭证
    creds = None
    if os.path.exists('token.json'):
        creds = Credentials.from_authorized_user_file('token.json', SCOPES)
    
    # 如果没有有效凭证，则通过OAuth2.0进行用户身份验证
    if not creds or not creds.valid:
        if creds and creds.expired and creds.refresh_token:
            creds.refresh(Request())
        else:
            flow = InstalledAppFlow.from_client_secrets_file(
                'credentials.json', SCOPES)
            creds = flow.run_local_server(port=0)
        
        # 保存凭证以供下次使用
        with open('token.json', 'w') as token:
            token.write(creds.to_json())
    
    # 使用凭证构建Gmail API客户端
    service = build('gmail', 'v1', credentials=creds)
    
    # 获取最新的邮件
    results = service.users().messages().list(userId='me', labelIds=['INBOX'], q='is:unread').execute()
    messages = results.get('messages', [])
    
    if not messages:
        print('没有未读邮件。')
    else:
        print('最新的未读邮件：')
        for message in messages:
            msg = service.users().messages().get(userId='me', id=message['id']).execute()
            payload = msg['payload']
            headers = payload['headers']
            
            for header in headers:
                name = header['name']
                value = header['value']
                if name.lower() == 'from':
                    print('发件人：', value)
                if name.lower() == 'subject':
                    print('主题：', value)
            
            # 解码邮件正文
            parts = payload.get('parts')
            if parts:
                for part in parts:
                    if part['body'] and part['body']['attachmentId']:
                        attachment = service.users().messages().attachments().get(
                            userId='me', messageId=message['id'], id=part['body']['attachmentId']).execute()
                        data = attachment['data']
                        file_data = base64.urlsafe_b64decode(data)
                        print('附件：', part['filename'])
                    else:
                        body = part['body']
                        data = body['data']
                        file_data = base64.urlsafe_b64decode(data)
                        text = file_data.decode('utf-8')
                        print('正文：', text)

# 调用函数来读取新的Gmail邮件
read_gmail()