mac 安装 python3

mac自带多个低版本的python

查看python版本

python --version

 Python 2.7.16

python3 --version

Python 3.7.3 

安装homebrew （已安装的略过）

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

 或者

/bin/zsh -c "$(curl -fsSL https://gitee.com/cunkai/HomebrewCN/raw/master/Homebrew.sh)"

 安装python3最新3.8.5

brew install python

python会安装到

/usr/local/Cellar目录下

mac系统自带python在

 /usr/bin/ 目录下包含python3 的（貌似3.7.3版本）

修改默认设置为刚安装的版本

export PATH=${PATH}:/usr/local/Cellar/python@3.8/3.8.5/bin

alias python="/usr/local/Cellar/python@3.8/3.8.5/bin/python3"

alias pip="/usr/local/Cellar/python@3.8/3.8.5/bin/pip3"

此时查看版本为刚安装的版本

在终端查看python3

which python3

/usr/bin/python3

配置Sublime Text

Tools->Build System->New Build System

python3配置信息

系统自带的python3

{
    "cmd": ["/usr/bin/python3", "-u", "$file"],
    "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
    "selector": "source.python"

}

python3.8.5安装路径 如果你在这个路径找不到python3 替换自己的电脑的python3.8.5路径

{
    "cmd": ["/usr/local/Cellar/python@3.8/3.8.5/bin/python3", "-u", "$file"],
    "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
    "selector": "source.python"

}

保存文件路径默认名字随意但是必须为 .sublime-build 的文件后缀

比如 python3..sublime-build | python3.8.5..sublime-build | python3.7..sublime-build

方便区分不同版本

1.打开终端输入：python3

2.导入sys包：import sys

3.查找路径 ：sys.path