Python Selenium中ChromeDriver无法运行，求助排查Mac安装脚本问题

Let’s break down the most likely reasons your ChromeDriver isn’t playing nice with Selenium on your new Mac, and how to fix them step by step:

1. Chrome Browser ↔ ChromeDriver Version Mismatch #

This is the #1 culprit more often than not. ChromeDriver must match the exact major version of your Chrome browser. Here’s how to verify:

• Open Chrome, go to Settings > About Chrome to get your browser version (e.g., 120.0.6099.109)
• Run this in terminal to check your ChromeDriver version:

  chromedriver --version
  

If the versions don’t align:

• Either update/downgrade Chrome to match your ChromeDriver, or
• Manually download the matching ChromeDriver version and replace the one installed via Homebrew (usually located at /usr/local/bin/chromedriver)

2. Broken or Temporary PATH Configuration #

Your install script uses export PATH=$PATH:/..., but that only applies to the current terminal session. Plus, you might have entered the wrong path entirely.

• First, find ChromeDriver’s actual install location with:

  which chromedriver
  

• To make the path permanent (new macOS uses zsh by default), add this to your ~/.zshrc file:

  echo 'export PATH="$PATH:/usr/local/bin"' >> ~/.zshrc
  source ~/.zshrc
  

• Alternatively, skip PATH setup entirely and point directly to ChromeDriver in your Python script:

  from selenium import webdriver
  
  # For Selenium versions <4.6.0
  driver = webdriver.Chrome(executable_path="/usr/local/bin/chromedriver")
  
  # For Selenium 4.6.0+ (auto-manages drivers, but you can still specify if needed)
  from selenium.webdriver.chrome.service import Service
  driver = webdriver.Chrome(service=Service("/usr/local/bin/chromedriver"))
  

3. macOS Security Blocking ChromeDriver #

Fresh Macs block unsigned third-party tools by default. If you see a pop-up saying ChromeDriver can’t be opened, or get a terminal error about permissions:

• Go to System Settings > Privacy & Security > General – you’ll see a notice that ChromeDriver was blocked. Click "Allow"
• Or run this terminal command to remove the quarantine flag:

  xattr -d com.apple.quarantine /usr/local/bin/chromedriver
  

4. Outdated Selenium Version #

Older Selenium versions might not support newer ChromeDriver releases. Check your Selenium version:

pip show selenium

If it’s below version 4, upgrade it:

pip install --upgrade selenium

5. Test ChromeDriver Alone First #

Before blaming your Python script, verify ChromeDriver works on its own. Run this in terminal:

chromedriver

If you see output like Starting ChromeDriver 120.0.6099.109 ... on port 9515, then ChromeDriver is functional – the issue is in your Selenium code. If you get errors here, fix those first (permissions, version, etc.).

Start with checking version mismatch and PATH setup – those are the most common fixes for fresh macOS setups.

内容的提问来源于stack exchange，提问作者Daniel Stojanovic