'How do I use brew installed Python as the default Python?

I try to switch to Homebrew (after using fink and macport) on Mac OS X 10.6.2. I have installed python 2.7 with

brew install python

The problem is that, contrary to Macport, it seems that there is no python_select utility, and my default mac python is always default

which python

give me

/usr/bin/python

and /usr/bin/python is not a symlink

How can I do to make python brew flavour to be my default python ?

python homebrew

Solution 1:^[1]

As you are using Homebrew the following command gives a better picture:

brew doctor

Output:

==> /usr/bin occurs before /usr/local/bin This means that system-provided programs will be used instead of those provided by Homebrew. This is an issue if you eg. brew installed Python.

Consider editing your .bash_profile to put: /usr/local/bin ahead of /usr/bin in your $PATH.

Solution 2:^[2]

As suggested by the homebrew installer itself, be sure to add this to your .bashrc or .zshrc:

export PATH="/usr/local/opt/python/libexec/bin:$PATH"

Solution 3:^[3]

See: How to symlink python in Homebrew?

$ brew link --overwrite python
Linking /usr/local/Cellar/python/2.7.3... 28 symlinks created
$ which python
/usr/local/bin/python

Solution 4:^[4]

Quick fix:

Open /etc/paths
Change the order of the lines (highest priority on top)

In my case /etc/paths looks like:

/usr/local/bin
/usr/local/sbin
/usr/bin
/bin
/usr/sbin
/sbin

If you want to know more about paths in OSX I found this article quite useful:

http://muttsnutts.github.com/blog/2011/09/12/manage-path-on-mac-os-x-lion/

Solution 5:^[5]

I did "brew install python" for OSX High Sierra. The $PATH had /usr/local/bin before any other path but still which python was pointing to the system's python.

When I looked deeper I found that there is no python executable at /usr/local/bin. The executable is named python2. To fix this problem create a symbolic link python pointing to python2:

/usr/local/bin $: ln -s python2 python

Solution 6:^[6]

python formula now uses python3(v3.6.5 for now), brew will link the directory:

/usr/local/opt/python -> ../Cellar/python/3.6.5

it will also link the binary:

/usr/local/bin/python3 -> ../Cellar/python/3.6.5/bin/python3

If you still need to use python2.x, use:

brew install python@2

To use homebrew's python, just put its directory in PATH, for bash:

export PATH="/usr/local/opt/python/libexec/bin:$PATH"

for fish:

set -x PATH /usr/local/opt/python/libexec/bin $PATH

Note:

doing this will shadow the system default version of python
homebrew used to link python to /usr/local/share/python in older versions.

Solution 7:^[7]

Homebrew does NOT replace stuff in "/usr/bin". You'll just want to put "/usr/local/bin" ahead of "/usr/bin" in your path, then "which python" will give you "/usr/local/bin/python".

Replacing /usr/bin/python (or /usr/bin/ruby) is highly unrecommended.

Solution 8:^[8]

For Apple Silicon machines, the path are slightly different. After running brew install python, you must ensure your ~/.zshrc uses the correct Homebrew paths:

# Homebrew
eval "$(/opt/homebrew/bin/brew shellenv)"

# Homebrew: Python
export PATH="/opt/homebrew/opt/python/libexec/bin:$PATH"

Results:

% which python
/opt/homebrew/opt/python/libexec/bin/python

% python --version
Python 3.9.9

% which pip
/opt/homebrew/opt/python/libexec/bin/pip

% pip -V
pip 21.3.1 from /opt/homebrew/lib/python3.9/site-packages/pip (python 3.9)

Solution 9:^[9]

Modify your $PATH, Add this in your bashrc or bash_profile:

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

more click here: Issue #89791

Solution 10:^[10]

I did brew install python, my $PATH was good, but still, which python gave me the system installed one. Restarting the terminal fixed it.

Solution 11:^[11]

You need to edit your PATH environmental variable to make sure wherever the homebrew python is located is searched before /usr/bin. You could also set things up in your shell config to have a variable like PYTHON be set to your desired version of python and call $PYTHON rather than python from the command line.

Also, as another poster stated (and especially on mac) DO NOT mess with the python in /usr/bin to point it to another python install. You're just asking for trouble if you do.

Solution 12:^[12]

python now points to python3, if you need python 2 then do: brew install python@2 and then in your .zshrc or .bashrc file export PATH="/usr/local/opt/python@2/libexec/bin:$PATH" Now, pyhon --version = Python 2.7.14 and python3 --version = Python 3.6.4. That's the behavior I'm used to seeing in my terminal.

Solution 13:^[13]

I believe there are means to make homebrew python default, but in my opinion the proper way to solve a problem is not to mess with system python paths: it is better to create a virtualenv in which homebrew python would be default (by using virtualenv --python option). Using tools like python_select is almost always a bad idea.

Solution 14:^[14]

Use pyenv instead to install and switch between versions of Python. I've been using rbenv for years which does the same thing, but for Ruby. Before that it was hell managing versions.

Consult pyenv's github page for installation instructions. Basically it goes like this: - Install pyenv using homebrew. brew install pyenv - Add a function to the end of your shell startup script so pyenv can do it's magic. echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n eval "$(pyenv init -)"\nfi' >> ~/.bash_profile

Use pyenv to install however many different versions of Python you need. pyenv install 3.7.7.
Set the default (global) version to a modern version you just installed. pyenv global 3.7.7.
If you work on a project that needs to use a different version of python, look into pyevn local. This creates a file in your project's folder that specifies the python version. Pyenv will look override the global python version with the version in that file.

Solution 15:^[15]

Add the /usr/local/opt/python/libexec/bin explicitly to your .bash_profile:

export PATH="/usr/local/opt/python/libexec/bin:$PATH"

After that, it should work correctly.

Solution 16:^[16]

Just do:

brew install python
brew link python

After doing that, add this to your bashrc or bash_profile:

alias python='/usr/local/bin/python2'

Enjoy!

Solution 17:^[17]

You can edit /etc/paths. Here is mine:

/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin

Then add a symlink for the python version. In my case

$ cd /usr/local/bin
$ ln -s python3 python

Voila!

Solution 18:^[18]

If you are fish shell

echo 'set -g fish_user_paths "/usr/local/opt/python/libexec/bin" $fish_user_paths' >> ~/.config/fish/config.fish

Solution 19:^[19]

Since High Sierra, you need to use:

sudo chown -R $(whoami) $(brew --prefix)/*

This is because /usr/local can no longer be chowned

Solution 20:^[20]

brew link python

And you must create/add an alias for python and put it in your .zprofile (Located in Users/username folder, if you press Shift+command+.

This must point to your homebrew python installation location.

alias python ='opt/homebrew/bin/python3'

Solution 21:^[21]

try this

which python3

Try typing python3 instead of just python

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	bbaassssiiee
Solution 2	Pamput
Solution 3	Community
Solution 4	Bijan
Solution 5	Kirkland
Solution 6	PickBoy
Solution 7
Solution 8	TruMan1
Solution 9	Aben
Solution 10	Martijn Courteaux
Solution 11	JoshAdel
Solution 12	pixel 67
Solution 13	Mikhail Korobov
Solution 14	mpoisot
Solution 15	Dmytro Melnychuk
Solution 16	Aaditya Prasad
Solution 17
Solution 18	KelaKing
Solution 19	zaolian
Solution 20	elmosweb
Solution 21	Muhammad Hashir uddin

'How do I use brew installed Python as the default Python?

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