2019-02-20

MacOS安装python3的各种报错信息

mac自带的python版本是2.7.10，安装qrcode时报错，考虑到版本太老，2020年就停止维护了，就安装python3，两台电脑安装时遇到了不一样的问题

brew install python3

1. 报错如下：

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
Mac-mini-97:baseline_ios_resign_enterprise admin$ sudo brew install python3
Password:
Error: Running Homebrew as root is extremely dangerous and no longer supported.

解决方案：

    sudo mkdir /usr/local/Frameworks
    sudo chown $(whoami):admin /usr/local/Frameworks
    brew link python3

python3安装成功：

Mac-mini-97:Frameworks admin$ python3
Python 3.7.2 (default, Feb 20 2019, 11:29:21) 
[Clang 10.0.0 (clang-1000.11.45.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

按说安装python3时应该会直接安装pip3，但是不知道什么原因pip3没有安装成功

Mac-mini-97:site-packages admin$ pip --version
pip 19.0.2 from /Library/Python/2.7/site-packages/pip-19.0.2-py2.7.egg/pip (python 2.7)
Mac-mini-97:site-packages admin$ pip3
-bash: pip3: command not found

执行下面的命令安装pip3

Mac-mini-97:site-packages admin$ brew postinstall python3

2. 执行brew install python3时报错如下

Error: Could not link:
/usr/local/share/doc/homebrew

Please delete these paths and run `brew update`.
Error: Xcode alone is not sufficient on High Sierra.
Install the Command Line Tools:
  xcode-select --install

解决方案：

1. rm -rf /usr/local/share/doc/homebrew
2. brew update
3. xcode-select --install
4. brew install python3

这次执行完brew install python3后pip3也自动安装好了