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I have updated my python 3 to the latest version 3.8:

brew search python ==> Formulae app-engine-python gst-python python ✔ [email protected] ✔ boost-python ipython python-markdown wxpython boost-python3 micropython python-yq ==> Casks awips-python kk7ds-python-runtime mysql-connector-python

But when I check the python3 version on my mac it still shows 3.7:

python3 --version Python 3.7.6

how can I default python3 to the latest 3.8 version using Homebrew ?

Edit: When I tried to use brew switch, it tells me I only installed python 3.7.6, but with last brew upgrade I'm pretty sure that python3.8.1 is installed with Homebrew

brew switch python 3.8.1 python does not have a version "3.8.1" in the Cellar. python's installed versions: 3.7.6_1
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4 Answers 4

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55

Here is the solution:

If existing symlinks belong to python 3.7 you should unlink them:
brew unlink python

Basically all you need to do:
brew link --force [email protected]

OR force the link and overwrite all conflicting files:
brew link --force --overwrite [email protected]

OR if needed list all files that would be deleted:
brew link --overwrite --dry-run [email protected]

Thus you can switch to any python version available in the Homebrew repo.

Also check out this answer for pyenv usage

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13

Ok, thanks to @gromgit from Homebrew community discussion (https://discourse.brew.sh/t/how-to-default-python-3-8-on-my-mac-using-homebrew/7050)

Here is the solution:

$ brew info [email protected] [email protected]: stable 3.8.1 (bottled) [keg-only] ... ==> Caveats Python has been installed as /usr/local/opt/[email protected]/bin/python3 ... [email protected] is keg-only, which means it was not symlinked into /usr/local, because this is an alternate version of another formula. If you need to have [email protected] first in your PATH run: echo 'export PATH="/usr/local/opt/[email protected]/bin:$PATH"' >> ~/.bash_profile For compilers to find [email protected] you may need to set: export LDFLAGS="-L/usr/local/opt/[email protected]/lib" For pkg-config to find [email protected] you may need to set: export PKG_CONFIG_PATH="/usr/local/opt/[email protected]/lib/pkgconfig"

I will stick to python (v3.7.6) at this time and wait for seamless upgrade of v3.8.1 in the future releases.

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3

I have a company Mac with Python 2.7 preinstalled to run older software.

$ brew install pyenv (successful) $ pyenv install 3.9.2 (successful) $ python --version Python 2.7 $ pyenv global 3.9.2 $ python --version Python 2.7

It still says Python 2.7, so, I did the following commands

pyenv init eval "$(pyenv init -)" $ python --version Python 3.9.2

More details: Link

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You might have to add python 3.8.1 to your PATH in your ~/.bash_profile and put it first so that it overrides previous installations. First find out where python 3.8.1 was installed, then add it to your path like this:

export PATH="/PATH_TO_PYTHON/:${PATH}"

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[email protected]: stable 3.8.1 (bottled) [keg-only] Interpreted, interactive, object-oriented programming language https://www.python.org/ /usr/local/Cellar/[email protected]/3.8.1 (4,127 files, 63.4MB)

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