标签: playwright-python

我已经开始学习playwright-python，该包playwright有两个子模块async_api和sync_api。然而，我找不到关于它们各自优缺点的更深入的描述或讨论。从他们的名字来看，我假设同步 API 调用是阻塞的，而异步 API 调用在后台运行？

它们的功能是否不同，即是否存在无法sync_api完成您可以使用 来完成的事情的情况async_api（反之亦然）？

在 playwright-python 中我知道我可以得到一个elementHandleusing querySelector().

示例（同步）：

from playwright import sync_playwright

with sync_playwright() as p:
    for browser_type in [p.chromium, p.firefox, p.webkit]:
        browser = browser_type.launch()
        page = browser.newPage()  
        page.goto('https://duckduckgo.com/')
        element = page.querySelector('input[id=\"search_form_input_homepage\"]')
    

如何根据 this 获取相对于此的元素elementHandle？即父母、祖父母、兄弟姐妹、孩子的句柄？

我想用它Except TimeoutError来处理超时问题。但脚本总是抛出一个超时错误，而不是按照我的计划打印消息。

这是我的代码：

try:
    await page.wait_for_selector("#winiframe_main", timeout=10000, state='detached')
    print("The frame is detached.")
except TimeoutError:
    print("The frame is not detached")

我的代码有什么问题吗？

我有 PHP 脚本，我使用带有 URL 参数的代码调用 python 函数：

import json
import sys
import urllib.parse
link = urllib.parse.unquote(sys.argv[1])
from playwright.sync_api import sync_playwright
with sync_playwright() as p:
    browser = p.chromium.launch()
    context = browser.new_context(user_agent='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36')
    page = context.new_page()
    cookie_file = open('./cookies.json')
    cookies = json.load(cookie_file)
    print(cookies)
    context.add_cookies(cookies)
    page.goto(link)
    try:
        page.wait_for_timeout(10000)
        print(page.innerHTML("*"))
        page.close()
        context.close()
        browser.close()      
    except Exception as e:
        print("Error in playwright script.")
        page.close()
        context.close()
        browser.close()     

但是，当我访问页面后想打印页面源时，我收到

Error in playwright script.

因为我尝试过的代码不起作用：

print(page.innerHTML("*"))

有什么帮助吗？

目前我使用下面的代码打开一个新的浏览器会话，但它总是以隐身方式启动，我可以启动一个新的 chromium 会话但不以隐身方式启动吗？：

from behave import *
from playwright.sync_api import sync_playwright
import time


class session_driver:
    driver = None

    def open_browser(self, url):
        playW_sync_instace = sync_playwright().start()
        global browser
        browser = playW_sync_instace.chromium.launch(headless=False)
        browser.new_context(record_video_dir="videos/",
        record_video_size={"width": 640, "height": 480})
        self.driver = browser.new_page()
        self.driver.goto(url)

我正在使用 Playwright 上传文件并下载结果。当输入文件很大并且需要很长时间来处理时，我会从剧作家那里得到一个超时；“下载”按钮需要很长时间才会出现。

    raise exception
playwright._impl._api_types.TimeoutError: Timeout 30000.0ms exceeded while waiting for event "download"
=========================== logs ===========================
waiting for event "download"
============================================================

我怎样才能让剧作家在那个特定事件上等待更长时间？

with page.expect_download() as download_info:
    page.locator("text=Download").click()
    #todo: wait longer?
download = download_info.value
# expect(page).to_have_url("http://localhost:8080/swagger/#/NER/post_ner")
path = download.path()
suggested_filename = file_out
download.save_as(suggested_filename)