目录

背景

沙箱安装selenium

demo编写

运行并查看效果

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背景

上一篇已经教大家怎么创建一个python项目了。这一篇分享如何写selenium的hello world。

沙箱安装selenium

第一篇，我们装了一个selenium,那个是全局的，但是现在我们使用沙箱，所以需要再局部再次安装selenium。

如下：

(venv) O:\python\selenium-test>pip install selenium
Looking in indexes: https://pypi.doubanio.com/simple/
Collecting seleniumDownloading https://pypi.doubanio.com/packages/80/d6/4294f0b4bce4de0abf13e17190289f9d0613b0a44e5dd6a7f5ca98459853/selenium-3.141.0-py2.py3-none-any.whl (904 kB)|████████████████████████████████| 904 kB 2.2 MB/s
Collecting urllib3Downloading https://pypi.doubanio.com/packages/9f/f0/a391d1463ebb1b233795cabfc0ef38d3db4442339de68f847026199e69d7/urllib3-1.25.10-py2.py3-none-any.whl (127 kB)|████████████████████████████████| 127 kB 3.3 MB/s
Installing collected packages: urllib3, selenium
Successfully installed selenium-3.141.0 urllib3-1.25.10
WARNING: You are using pip version 20.1.1; however, version 20.2.2 is available.
You should consider upgrading via the 'o:\python\selenium-test\venv\scripts\python.exe -m pip install --upgrade pip' command.

demo编写

然后，在项目默认创建的main.py里头，删除所有默认的样例代码，输入如下内容：

from selenium import webdriverdriver = webdriver.Chrome()
driver.get('https://www.baidu.com')print(driver.title)driver.quit()

运行并查看效果

按照python程序的运行方式，运行main.py文件，笔者喜欢使用命令的方式：

python main.py

效果：

报错了

(venv) O:\python\selenium-test>python main.py
Traceback (most recent call last):File "o:\python\selenium-test\venv\lib\site-packages\selenium\webdriver\common\service.py", line 76, in startstdin=PIPE)File "C:\Users\32631\AppData\Local\Programs\Python\Python36\lib\subprocess.py", line 707, in __init__restore_signals, start_new_session)File "C:\Users\32631\AppData\Local\Programs\Python\Python36\lib\subprocess.py", line 990, in _execute_childstartupinfo)
FileNotFoundError: [WinError 2] 系统找不到指定的文件。During handling of the above exception, another exception occurred:Traceback (most recent call last):File "main.py", line 4, in <module>driver = webdriver.Chrome()File "o:\python\selenium-test\venv\lib\site-packages\selenium\webdriver\chrome\webdriver.py", line 73, in __init__self.service.start()File "o:\python\selenium-test\venv\lib\site-packages\selenium\webdriver\common\service.py", line 83, in startos.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/h
ome

上述错误原因，是因为还缺乏一个自动化测试的浏览器插件。详见下一篇。