如何在 Mac 上将 Python3 设置为默认的 Python 版本？

Question

有没有办法将 Python 3.8.3 设置为 macOS Catalina 上的默认 Python 版本——版本 10.15.2？

我做过的步骤：

1. 看看安装在哪里。

ls -l /usr/local/bin/python*

我得到的输出是这样的：

lrwxr-xr-x  1 jeena  admin  36 Mar 20  2019 /usr/local/bin/python -> ../Cellar/python@2/2.7.16/bin/python
lrwxr-xr-x  1 jeena  admin  39 May 20 12:43 /usr/local/bin/python-build -> ../Cellar/pyenv/1.2.18/bin/python-build
lrwxr-xr-x  1 jeena  admin  43 Mar 20  2019 /usr/local/bin/python-config -> ../Cellar/python@2/2.7.16/bin/python-config
lrwxr-xr-x  1 jeena  admin  37 Mar 20  2019 /usr/local/bin/python2 -> ../Cellar/python@2/2.7.16/bin/python2
lrwxr-xr-x  1 jeena  admin  44 Mar 20  2019 /usr/local/bin/python2-config -> ../Cellar/python@2/2.7.16/bin/python2-config
lrwxr-xr-x  1 jeena  admin  39 Mar 20  2019 /usr/local/bin/python2.7 -> ../Cellar/python@2/2.7.16/bin/python2.7
lrwxr-xr-x  1 jeena  admin  46 Mar 20  2019 /usr/local/bin/python2.7-config -> ../Cellar/python@2/2.7.16/bin/python2.7-config
lrwxr-xr-x  1 root   wheel  69 May 20 12:22 /usr/local/bin/python3 -> ../../../Library/Frameworks/Python.framework/Versions/3.8/bin/python3
lrwxr-xr-x  1 root   wheel  76 May 20 12:22 /usr/local/bin/python3-config -> ../../../Library/Frameworks/Python.framework/Versions/3.8/bin/python3-config
lrwxr-xr-x  1 root   wheel  71 May 20 12:22 /usr/local/bin/python3.8 -> ../../../Library/Frameworks/Python.framework/Versions/3.8/bin/python3.8
lrwxr-xr-x  1 root   wheel  78 May 20 12:22 /usr/local/bin/python3.8-config -> ../../../Library/Frameworks/Python.framework/Versions/3.8/bin/python3.8-config
lrwxr-xr-x  1 jeena  admin  37 Mar 20  2019 /usr/local/bin/pythonw -> ../Cellar/python@2/2.7.16/bin/pythonw
lrwxr-xr-x  1 jeena  admin  38 Mar 20  2019 /usr/local/bin/pythonw2 -> ../Cellar/python@2/2.7.16/bin/pythonw2
lrwxr-xr-x  1 jeena  admin  40 Mar 20  2019 /usr/local/bin/pythonw2.7 -> ../Cellar/python@2/2.7.16/bin/pythonw2.7

2. 将默认的 python 符号链接更改为我想从上面使用的版本：

ln -s -f /usr/local/bin/python3.8 /usr/local/bin/python2.7

然后我再次检查了版本：

python --version

我把它作为--> Python 2.7.16

我也尝试过，alias python="/usr/bin/python3.8"但遗憾的是它仍然是 Python 2.7.16

Answer 1

我认为您可以运行以下命令：

rm /usr/local/bin/python
ln -s /usr/local/bin/python3.8 /usr/local/bin/python

在你的 ~/.zshrc 或 ~/.bashrc 中，把

export PATH=/usr/local/bin:$PATH

然后启动一个新的终端来测试

echo $PATH

确保 /usr/local/bin 在 /usr/bin 之前