1 安裝Xcode

xcode-select --install

2 安裝Homebrew

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"


清華大學(xué)鏡像
cd "$(brew --repo)"
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git

cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git

brew update

3 安裝Python

接下來要正式進(jìn)入安裝Python的步驟了！
首先，輸入

python --version
打印出 Python 2.7.10 ，是mac自帶的，不需要卸載

開始安裝：
利用homebrew搜索Python

brew search python

會有如下結(jié)果：

app-engine-python  gst-python         python ?           wxpython
boost-python       ipython            python-markdown    zpython
boost-python3      ipython@5          python-yq
boost-python@1.59  micropython        python@2 ?

==> Casks
awips-python              kk7ds-python-runtime      mysql-connector-python

If you meant "python" specifically:
It was migrated from homebrew/cask to homebrew/core.

開始安裝：

brew install python

brew install python3

查看安裝的目錄 /usr/local/Cellar/

4 設(shè)定路徑$PATH (不和系統(tǒng)Python干擾)

執(zhí)行 
1、echo $PATH
打印出
/usr/local/opt/gettext/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

打開 
2、sudo vim /etc/paths
系統(tǒng)會按以下順序去索引
/usr/local/bin:
/usr/bin:
/bin:
/usr/sbin:
/sbin

5 安裝完成，確認(rèn)結(jié)果

which python
打印出  /usr/local/bin/python和/usr/local/bin/python3 說明安裝正確

如果想使用系統(tǒng)的Python，就輸入

/usr/bin/python

轉(zhuǎn)載自 https://blog.csdn.net/hou_manager/article/details/79555809
個人怕忘記，所以簡書上抄了一份過來，感謝分享。