Change python3 command directory in terminal

Question

Problem: I am using Mac Catalina 10.15. I know that Catalina installed Python 2.7 already and I installed Python 3.7.3. Then I also installed Anaconda which contained Conda, Python 3.7.3. Now I have 3 Pythons:

A. /usr/bin/python -> python 2.7
B. /usr/bin/python3 -> python 3.7.3
C. /Users/david/anaconda3/python.app/Contents/MacOS/python -> python 3.7.6

When I type "python3" in terminal it will run B. But I want to change "python3" command to open C.

What I tried: I found "/Users/david/.bash_profile" and added

alias python3="/Users/david/opt/anaconda3/python.app/Contents/MacOS/python"

at end of the file but "python3" still opens B. How can I open Anaconda Python by typing "python3" in the terminal?

Hello Noah, you are correct. It works. Thank you very much. End this post plz. — David
– David, Commented Apr 9, 2020 at 13:34
Read my answer if you want it to load your aliases automatically every new session :) — Captain Jack Sparrow
– Captain Jack Sparrow, Commented Apr 9, 2020 at 13:43

Captain Jack Sparrow · Accepted Answer · 2020-04-09 13:41:54Z

2

If you have not so already, try running:

$ source ~/.bash_profile

That will load all your settings for the current terminal session. However, this will not load automatically when you start a new terminal session. For this to happen, you first need to know what shell you are running.
Run:

$ echo $SHELL
/bin/zsh

If it returns /bin/zsh like mine does(which it should since this is MacOS Catalina), you must copy your alias to the bottom of ~/.zshrc. Then your alias will automatically be loaded when you start a new terminal session.
If for some reason echo $SHELL returns something other than /bin/zsh, run:

$ chsh -s /bin/zsh

which will change your shell to zsh. Then your alias settings in ~/.zshrc will be loaded in every new terminal session.

answered Apr 9, 2020 at 13:41

Captain Jack Sparrow

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2 Comments

David Over a year ago

Thanks. I don't have ~/.zshrc so I add a file under /Users/david/. It works.

David Over a year ago

No. I noticed that I am not the default shell and changed back to zsh, just one hour before I read your answer. I don't know when and how I change to that shell. But anyway I changed back.

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