Selenium - 自动下载 webdriver-Toy模板网

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背景

很多浏览器会自动更新，但是 driver 不会自动更新。为了确保 driver 版本和浏览器匹配，可以使用第三方库 webdriver_manager

代码

这个文件里封装了几个函数
- driver_seek : 根据给定的目录，和文件名称，查找该目录下是否有这个文件
- driver_download : 下载 webdriver 到指定目录，如果path参数不指定，会下载到 C:\Users\当前用户名目录下，如果指定path，就下载到指定目录 —— 我因为有多个使用Selenium 的爬虫项目，所以会把 driver 下载到1个公用目录下
- driver_test ：测试上面这两个函数是否工作正常

# !/usr/bin/env python3
# _*_ coding:utf-8 _*_
"""
@File               : init_webdriver.py
@Project            : Scrapy
@CreateTime         : 2023/1/2 17:02
@Author             : biaobro
@Software           : PyCharm
@Last Modify Time   : 2023/1/2 17:02
@Version            : 1.0
@Description        : None
    @20230207
    # 安装webdriver-manager : pip install webdriver-manager
    # webdriver-manager 在python3.11 下报错无法使用，改用python3.10 后正常
    # 这个文件只需要完成 检测目标是否存在，如果不存在就下载的任务就好了，不需要做额外的设置，应用层的设置交给应用层
    # 如果不写main 函数，被导入时就会自动执行
"""
from selenium import webdriver

# chrome, firefox, edge, IE
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.chrome.service import Service as ChromeService
import os


# from webdriver_manager.firefox import GeckoDriverManager
# from webdriver_manager.microsoft import EdgeChromiumDriverManager
# from webdriver_manager.microsoft import IEDriverManager


def driver_seek(folder_name, file_name):
    """根据输入的文件名称查找对应的文件夹有无改文件，有则返回文件路径"""
    for root, dirs, files in os.walk(folder_name):
        if file_name in files:
            # 当层文件内有该文件，输出文件地址
            path = os.path.join(root, file_name)  # r'{0}\{1}'.format(root, file_name)
            print(path)
            print('the driver has already been there. you could load it freely.')
            return path
    print(file_name + " doesn't exist in " + folder_name + ', please download it firstly.')
    return None


def driver_download(path=None):
    try:
        # 默认 webdriver 会被下载到  .home/.wdm folder
        # 本机 [C:\Users\biaob\.wdm\drivers\chromedriver\win32\97.0.4692.71\chromedriver.exe]

        # silent logs and remove them from console
        # os.environ['WDM_LOG_LEVEL'] = '0'

        # disable the blank space in first line
        # os.environ['WDM_PRINT_FIRST_LINE'] = 'False'

        # 如果没有指定path参数，就下载到项目路径
        # 如果指定，就下载到指定路径
        if path is None:
            # By default, all driver binaries are saved to user.home/.wdm folder.
            # You can override this setting and save binaries to project.root/.wdm.
            # 设置 'WDM_LOCAL' = '1' 修改设置，下载文件到项目路径
            os.environ['WDM_LOCAL'] = '1'

            # 下载地址：https://chromedriver.chromium.org/downloads
            # 老式写法
            # browser = webdriver.Chrome(executable_path=ChromeDriverManager().install())  # , options=options)

            # 新式写法
            print("driver will be downloaded into default project folder.")
            ChromeService(ChromeDriverManager().install())
        else:
            # Set the directory where you want to download and save the webdriver.
            # You can use relative and absolute paths.
            print("driver will be downloaded into specified folder.")
            path = ChromeDriverManager().install()
            print(path)
        return True
    except Exception as e:
        print(e)
        return False


def driver_test(path, url="https://www.baidu.com"):
    driver_path = driver_init()
    # option set to avoid 'data' show in address bar
    options = webdriver.ChromeOptions()
    # options.add_argument('--no-sandbox')
    # options.add_argument('--disable-dev-shm-usage')
    # options.add_argument(r"user-data-dir=data")
    # options.add_argument(r"headless")
    browser = webdriver.Chrome(service=ChromeService(path), options=options)
    browser.get(url)
    if browser.title == "百度一下，你就知道":
        print("selenium browser headless mode visit Baidu test passed.")
    elif browser.title is not None:
        print(f"selenium browser headless mode visit {url} test passed.")
    else:
        print("selenium browser headless mode test failed!")
    # quit 必须要有，否则停留后台，需要在任务管理器中手动关闭
    browser.quit()


# specify the path directly
# 指定本地目录
# driver = webdriver.Chrome('D:\Download\chromedriver_win32\chromedriver.exe')

# 用法示例
def driver_init():
    parent_directory = r'..\\'
    file_name = r'chromedriver.exe'

    driver_path = driver_seek(parent_directory, file_name)

    if driver_path is not None:
        return driver_path
    else:
        driver_download(parent_directory)
        return driver_seek(parent_directory, file_name)