1. Download playwright library

pip install playwright==1.33.0
playwright install

2. playwright use

2.1 Import library

from playwright.sync_api import sync_playwright

2.2 Basic use

Start the engine, instantiate the object

 browser = playwright.chromium.launch(
 headless=False,channel='chrome')

create contextcontext
```
context = browser.new_context() 
```
create page object
```
page= context.new_page()
```
page request
```
page.goto('https://www.baidu.com/')
```
page close
```
context.close()
browser.close()  
```

Do not load images

import re
# 禁止加载图片，加速加载
def cancel_request(route):
    route.abort()

page.route(re.compile(r"(.png)|(.jpg)"), cancel_request)

maximize window

set parameters args=['--start-maximized']andno_viewport=True

with sync_playwright() as playwright:
    browser = playwright.chromium.launch(
        headless=False,
        args=['--start-maximized'], # 窗口大小打开最大
    )  # 启动引擎，实例化对象
    context = browser.new_context(no_viewport=True)  #显示最大窗口
    page = context.new_page()
    page.goto(url)

    context.close()
    browser.close()

Request Baidu total code

from playwright.sync_api import sync_playwright

url='https://www.baidu.com/'
with sync_playwright() as playwright:
    browser = playwright.chromium.launch(
        headless=True,              # 无头
        args=['--start-maximized'], # 窗口大小打开最大
        channel='chrome'            # 使用google浏览器打开
    )                               # 启动引擎，实例化对象
                                    # no_viewport=True显示最大窗口
    context = browser.new_context(no_viewport=True) # 需要创建一个 context，这是一个新的概念，不同于selenium，以后更为方便管理 cookies 和 ip代理
    
    page = context.new_page()
    page.goto(url)

    context.close()
    browser.close()

3. XPATH element positioning method

xpath tutorial ·
- Basic use of xpath

3.1 xpath positioning syntax

xpath=Just add the point before the xpath statement
```
 input_xpath = 'xpath= //input[@id="su"]'
```

3.2 Related operations

click element
```
page.locator(input_xpath).click()
```

Get element attributes

attribute1 = page.get_attribute(input_xpath, 'value')   # 获取元素value值
attribute2= page.get_attribute(input_xpath, 'href')     # 获取元素href值
attribute3 = page.get_attribute(input_xpath, 'src')     # 获取元素src值
attribute4 = page.get_attribute(input_xpath, 'id')  # 获取元素id值

get element text

text1=page.locator(ul).all_inner_texts()  # 获取所有元素列表
text2=page.locator(ul).inner_text()    # 所有元素字符串,所有文本变为一整个字符串

4. Waiting and caching

4.1 Waiting for operation

mandatory wait
```
import time
time.sleep(n)  
```
playwright force wait
```
page.wait_for_timeout(1000) # 单位ms
```

Set the maximum waiting time for access

Request Action Set Duration

page.goto(url, timeout=1000)  # 单位ms

Click to set the duration

page.locator(href_xpath).click(timeout=1000)   # 单位ms

4.2 Add cache

Add cache to improve loading speed

from playwright.sync_api import Playwright, sync_playwright

def run(playwright: Playwright) -> None:
    browser = playwright.firefox.launch_persistent_context(headless=False, args=['--start-maximized'],
                                                           user_data_dir=os.path.join(root_path, 'user_data'),# 保存缓存地址
                                                           accept_downloads=True, slow_mo=250)
    page = browser.new_page()
    page.goto('https://www.baidu.com/')

    browser.close()
with sync_playwright() as playwright:
    run(playwright)

playwright download and basic use