小编Suc*_*tra的帖子

我是 sqlalchemy 的新手，尝试在 mysql 中创建表。创建了一个虚拟环境并执行了以下命令。pip3 安装 sqlalchemy pip3 安装 sqlalchemy-migrate

Python 版本 - 3.6.4，但是当我尝试在终端上执行命令“python models.py”时，会弹出错误

File "models.py", line 1, in <module>
    from sqlalchemy import Table, Column, Integer, MetaData, ForeignKey, DateTime, Float, BigInteger, String, func
ModuleNotFoundError: No module named 'sqlalchemy'

from sqlalchemy import Table, Column, Integer, MetaData, ForeignKey, DateTime, Float, BigInteger, String, func

import helper.connection_util as connection_util

metadata = MetaData()

# employee TABLE
employee = Table('employee', metadata,
                    Column('employee_id', Integer, primary_key=True),
                    Column('employee_name', String(100)),
                    Column('employee_designation', String(100)),

metadata.create_all(connection_util.get_connection())

Node- v8.11.1 Headless Chrome
我试图生成 PDF，但不知何故在 PDF 中没有捕获背景图像。下面是代码。任何帮助表示赞赏

const puppeteer = require('puppeteer'); 
(async () => {
const browser = await puppeteer.launch({headless: true});
const page = await browser.newPage();
await page.goto('http://54.201.139.151/', {waitUntil : 'networkidle0'});
await page.pdf({path: 'hn40.pdf', printBackground: true, width: '1024px' , height: '768px'});
await browser.close();
})();