Selenium 4 Python Hub
Selenium is a popular tool for automating web browsers, and Selenium 4 brings many new features and improvements to the table. In this article, we will focus on using Selenium 4 with Python and setting up a hub for running tests in a distributed environment.
Setting up Selenium 4 with Python
To get started with Selenium 4 in Python, you first need to install the Selenium library. You can do this using pip:
pip install selenium
Next, you can create a simple Python script to open a browser using Selenium 4:
from selenium import webdriver
driver = webdriver.Chrome()
driver.get("
This script will open a Chrome browser and navigate to the example.com website. You can also use other browsers like Firefox or Safari by changing the webdriver.
Setting up a Selenium Hub
A Selenium Hub is a central point that controls the execution of Selenium tests on multiple machines. This allows you to run tests in a distributed environment, which can help speed up the testing process.
To set up a Selenium Hub, you can use the Selenium Grid feature. First, you need to download the Selenium Server jar file from the Selenium website. You can then start the hub using the following command:
java -jar selenium-server-standalone.jar -role hub
Once the hub is running, you can register nodes to it using the following command on each machine you want to use as a node:
java -jar selenium-server-standalone.jar -role node -hub http://localhost:4444/grid/register
Gantt Chart
gantt
title Selenium 4 Python Hub
section Setup
Install Selenium: done, 2022-01-01, 1d
Create Python script: done, after Install Selenium, 2d
section Selenium Hub
Download Selenium Server: done, 2022-01-03, 1d
Start Selenium Hub: done, after Download Selenium Server, 1d
Register Nodes: done, after Start Selenium Hub, 2d
Sequence Diagram
sequenceDiagram
participant TestScript
participant SeleniumHub
participant SeleniumNode1
participant SeleniumNode2
TestScript ->> SeleniumHub: Request to run test
SeleniumHub -->> TestScript: Assign test to Node1
SeleniumHub -->> TestScript: Assign test to Node2
SeleniumHub ->> SeleniumNode1: Execute test
SeleniumNode1 -->> SeleniumHub: Return test result
SeleniumHub ->> SeleniumNode2: Execute test
SeleniumNode2 -->> SeleniumHub: Return test result
SeleniumHub -->> TestScript: Aggregate test results
In conclusion, Selenium 4 brings many new features and improvements to the table, making it even easier to automate web browsers. By setting up a Selenium Hub, you can run tests in a distributed environment, improving efficiency and speed. With the combination of Selenium 4 and Python, you can create powerful automation scripts for your web testing needs.
