1, install Homebrew
https://brew.sh/index_zh-cn.html
2, through the brew installation pyenv
1) command line, enter:
$ brew install pyenv (If you have been stuck in Updating Homebrew press ctrl + c on a jump brew update)
2) In the .bash_profile file in the home directory is added:
vi ~ / .bash_profile added at the end
eval "$(pyenv init -)"
3) command line input, update the environment variable:
$ Source .bash_profile
Note: if not configured can not switch between the python version.
3, using pyenv installation A Python 3
1) View can be installed version (only version is the official version, the other is a derivative version)
$ Source .bash_profile
2) install the required version:
$ pyenv install 3.7.4 -v (see What are some versions can be installed: pyenv install --list)
3) Upon completion of the update the database:
$ pyenv rehash
4) Check the system installed version:
$ pyenv versions
* number indicates the version of the system currently in use
5) switching python version
$ 3.6.2 Global pyenv
$ pyenv Global System
6) confirm the version of python
python --version
4, solve Python command to install with pip slow, mirroring domestic use
There ~ / .pip / pip.conf
[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host=mirrors.aliyun.com