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    python palywright库基本使用

    作者:测神 时间:2021-02-06 06:16

    开源方:微软

    安装:pip install playwright;python -m playwright install

    特点:自动化脚本录制;有同步、异步api

    生成代码指令:python -m playwright codegen
    其他:需要Python 3.7及以上;官方api为node版本,python版本待补充

    同步:关键字为:sync_playwright

    from time import sleep
    from playwright import sync_playwright
    with sync_playwright() as p:
      for browser_type in [p.chromium, p.firefox, p.webkit]:
        browser = browser_type.launch(headless=False) # 默认无头,这样为有头模式
        page = browser.newPage()
        page.goto('http://baidu.com')
        page.fill("input[name=\"wd\"]", "AirPython")
        with page.expect_navigation():
          page.press("input[name=\"wd\"]", "Enter")
        page.waitForSelector("text=百度热榜")
        page.screenshot(path=f'example-{browser_type.name}.png')
        sleep(5)
        browser.close()

    异步:关键字为:async_playwright

    import asyncio
    from playwright import async_playwright
    async def main():
      async with async_playwright() as p:
        for browser_type in [p.chromium, p.firefox, p.webkit]:
          browser = await browser_type.launch(headless=False)
          page = await browser.newPage()
          await page.goto('http://baidu.com')
          await page.fill("input[name=\"wd\"]", "AirPython")
          await page.press("input[name=\"wd\"]", "Enter")
          await page.waitForSelector("text=百度热榜")
          await page.screenshot(path=f'example-{browser_type.name}.png')
          await browser.close()
    asyncio.get_event_loop().run_until_complete(main())

    集成 pytest 测试

    @pytest.fixture(scope="session")
    def test_playwright_is_visible_on_google(page):
      page.goto("https://www.google.com")
      page.type("input[name=q]", "Playwright GitHub")
      page.click("input[type=submit]")
      page.waitForSelector("text=microsoft/Playwright")

    执行 JS 代码

    from playwright import sync_playwright
    with sync_playwright() as p:
      browser = p.firefox.launch()
      page = browser.newPage()
      page.goto('https://www.example.com/')
      dimensions = page.evaluate('''() => {
      return {
          width: document.documentElement.clientWidth,
          height: document.documentElement.clientHeight,
          deviceScaleFactor: window.devicePixelRatio
          }  }''')
      print(dimensions)
      browser.close()

    中断网络请求

    from playwright import sync_playwright
    with sync_playwright() as p:
      browser = p.chromium.launch()
      page = browser.newPage()
    
    def log_and_continue_request(route, request):
      print(request.url)
      route.continue_()

    记录并继续所有网络请求

    page.route('**', lambda route, request: log_and_continue_request(route, request))
    page.goto('http://todomvc.com')
    browser.close()
    js
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