安装python后的.bash_profile设置

Question

我正在Mac (Catalina)上设置python环境。我已经安装了python3，并想通过输入"python“从终端启动它。

epipko@Eugenes-Mac ~ % python
Python 2.7.16 (default, Dec 13 2019, 18:00:32) 
[GCC 4.2.1 Compatible Apple LLVM 11.0.0 (clang-1100.0.32.4) (-macos10.15-objc-s on darwin
Type "help", "copyright", "credits" or "license" for more information.

epipko@Eugenes-Mac ~ % python3
Python 3.8.2 (v3.8.2:7b3ab5921f, Feb 24 2020, 17:52:18) 
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

我想为“.bash_profile”设置一个别名来打开python3，但是python不在那里。我已经创建了它并添加了别名，但我的别名不起作用

epipko@Eugenes-Mac ~ % ls -altr .bash_profile    
ls: .bash_profile: No such file or directory

epipko@Eugenes-Mac ~ % touch .bash_profile

epipko@Eugenes-Mac ~ % chmod 700 .bash_profile

epipko@Eugenes-Mac ~ % ls -altr .bash_profile 
-rwx------   1 epipko  staff     21 Apr  5 09:44 .bash_profile 

epipko@Eugenes-Mac ~ % cat .bash_profile
alias python=python3

另外，由于.bash_profile是在创建.bash_profile之前安装的，所以在python中是否缺少python特定的内容？我需要重新安装python吗？

Answer 1

在单引号内设置别名，如下所示：

epipko@Eugenes-Mac ~ % cat .bash_profile
alias python='python3'

编辑-1:在文件中添加上述内容后，运行source ~/.bash_profile或source ~/.bash_aliases或source ~/.bashrc。

例如：

$ python --version
Python 2.7.6
$ python3 --version
Python 3.8.2
$ alias python='python3'
$ python --version
Python 3.8.2

$ python
Python 3.8.2 (v3.8.2:7b3ab5921f, Feb 24 2020, 17:52:18)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>