Mac安装selenium和chromedriver

pip3 install selenium

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运行报错：
selenium.common.exceptions.WebDriverException: Message: 'chromedriver' executable needs to be in PATH. Please see https://sites.google.com/a/chromium.org/chromedriver/home

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安装chromedriver：
brew install chromedriver
可能会卡在Updating Homebrew...，ctrl+c

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或者切换Homebrew默认源，附上替换及重置命令行：

替换brew.git:
cd "$(brew --repo)"
git remote set-url origin https://mirrors.ustc.edu.cn/brew.git

替换homebrew-core.git:
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git 
重置brew.git:
cd "$(brew --repo)"
git remote set-url origin https://github.com/Homebrew/brew.git

重置homebrew-core.git:
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://github.com/Homebrew/homebrew-core.git

brew install chromedriver可能会提示xcode版本过低（其实并不低）

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需要升级Homebrew：

brew update-reset

如果碰到报错：Error: No available formula with the name "chromedriver"

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按他的提示执行：brew cask install chromedriver

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