如何链接Home BREW Python版本并将其设置为默认版本 [英] How to link home brew python version and set it as default

问题描述

我刚从MacPorts切换到自制软件。在安装了所有必需的XCode版本和其他软件后，我尝试使用自制软件安装python：我认为它安装成功，但是当我安装which python时，它仍然显示2.7.3，我认为这是Mountain Lion附带的版本。

which python
/usr/local/bin/python

python --version
Python 2.7.3

因此我尝试重新安装

brew install python --framework --universal
Warning: python-2.7.5 already installed, it's just not linked

但显示python 2.7.5已安装且未链接，我尝试brew link python

这导致我收到以下消息，所以我不知道我应该做什么：

正在链接/usr/local/Cella/python/2.7.5.警告：无法链接python。正在取消链接.

Error: Could not symlink file: /usr/local/Cellar/python/2.7.5/bin/smtpd2.py
Target /usr/local/bin/smtpd2.py already exists. You may need to delete it.
To force the link and overwrite all other conflicting files, do:
  brew link --overwrite formula_name

To list all files that would be deleted:
  brew link --overwrite --dry-run formula_name

推荐答案

使用brew install python3安装python3之后 我收到错误：

Error: An unexpected error occurred during the `brew link` step
The formula built, but is not symlinked into /usr/local
Permission denied @ dir_s_mkdir - /usr/local/Frameworks
Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks

键入brew link python3后，错误为：

Linking /usr/local/Cellar/python/3.6.4_3... Error: Permission denied @ dir_s_mkdir - /usr/local/Frameworks

要解决问题，请执行以下操作：

sudo mkdir -p /usr/local/Frameworks
sudo chown -R $(whoami) /usr/local/*
brew link python3

之后，我可以通过键入python3👍

打开python3

(来自https://github.com/Homebrew/homebrew-core/issues/20985)

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