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Install Python3 on Macos


$ brew install python3
Ignoring bcrypt-3.1.12 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.12
Ignoring bcrypt-3.1.11 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.11
Ignoring bigdecimal-1.3.5 because its extensions are not built.  Try: gem pristine bigdecimal --version 1.3.5
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring bootsnap-1.3.1 because its extensions are not built.  Try: gem pristine bootsnap --version 1.3.1
Ignoring byebug-10.0.2 because its extensions are not built.  Try: gem pristine byebug --version 10.0.2
Ignoring byebug-10.0.1 because its extensions are not built.  Try: gem pristine byebug --version 10.0.1
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
Ignoring bcrypt-3.1.12 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.12
Ignoring bcrypt-3.1.11 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.11
Ignoring bigdecimal-1.3.5 because its extensions are not built.  Try: gem pristine bigdecimal --version 1.3.5
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring bootsnap-1.3.1 because its extensions are not built.  Try: gem pristine bootsnap --version 1.3.1
Ignoring byebug-10.0.2 because its extensions are not built.  Try: gem pristine byebug --version 10.0.2
Ignoring byebug-10.0.1 because its extensions are not built.  Try: gem pristine byebug --version 10.0.1
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
Warning: python 3.7.4_1 is already installed and up-to-date
To reinstall 3.7.4_1, run `brew reinstall python`
$ brew uninstall python
Error: Refusing to uninstall /usr/local/Cellar/python/3.7.4_1
because it is required by glib, imagemagick, libheif, shared-mime-info, theharvester and vim, which are currently installed.
You can override this and force removal with:
  brew uninstall --ignore-dependencies python
$ brew uninstall --ignore-dependencies python
Uninstalling /usr/local/Cellar/python/3.7.4_1... (3,333 files, 53.0MB)

$ python --version
Python 2.7.10

$ brew install python3
Ignoring bcrypt-3.1.12 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.12
Ignoring bcrypt-3.1.11 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.11
Ignoring bigdecimal-1.3.5 because its extensions are not built.  Try: gem pristine bigdecimal --version 1.3.5
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring bootsnap-1.3.1 because its extensions are not built.  Try: gem pristine bootsnap --version 1.3.1
Ignoring byebug-10.0.2 because its extensions are not built.  Try: gem pristine byebug --version 10.0.2
Ignoring byebug-10.0.1 because its extensions are not built.  Try: gem pristine byebug --version 10.0.1
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
Ignoring bcrypt-3.1.12 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.12
Ignoring bcrypt-3.1.11 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.11
Ignoring bigdecimal-1.3.5 because its extensions are not built.  Try: gem pristine bigdecimal --version 1.3.5
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring bootsnap-1.3.1 because its extensions are not built.  Try: gem pristine bootsnap --version 1.3.1
Ignoring byebug-10.0.2 because its extensions are not built.  Try: gem pristine byebug --version 10.0.2
Ignoring byebug-10.0.1 because its extensions are not built.  Try: gem pristine byebug --version 10.0.1
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
Error: Xcode alone is not sufficient on Mojave.
Install the Command Line Tools:
  xcode-select --install

$   xcode-select --install
xcode-select: note: install requested for command line developer tools
$ brew install python3
Ignoring bcrypt-3.1.12 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.12
Ignoring bcrypt-3.1.11 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.11
Ignoring bigdecimal-1.3.5 because its extensions are not built.  Try: gem pristine bigdecimal --version 1.3.5
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring bootsnap-1.3.1 because its extensions are not built.  Try: gem pristine bootsnap --version 1.3.1
Ignoring byebug-10.0.2 because its extensions are not built.  Try: gem pristine byebug --version 10.0.2
Ignoring byebug-10.0.1 because its extensions are not built.  Try: gem pristine byebug --version 10.0.1
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
Ignoring bcrypt-3.1.12 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.12
Ignoring bcrypt-3.1.11 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.11
Ignoring bigdecimal-1.3.5 because its extensions are not built.  Try: gem pristine bigdecimal --version 1.3.5
Ignoring bindex-0.5.0 because its extensions are not built.  Try: gem pristine bindex --version 0.5.0
Ignoring bootsnap-1.3.1 because its extensions are not built.  Try: gem pristine bootsnap --version 1.3.1
Ignoring byebug-10.0.2 because its extensions are not built.  Try: gem pristine byebug --version 10.0.2
Ignoring byebug-10.0.1 because its extensions are not built.  Try: gem pristine byebug --version 10.0.1
Ignoring byebug-9.1.0 because its extensions are not built.  Try: gem pristine byebug --version 9.1.0
==> Downloading https://homebrew.bintray.com/bottles/python-3.7.4_1.mojave.bottl
==> Downloading from https://akamai.bintray.com/38/387e32b735f3273bee16e8d8d2068
######################################################################## 100.0%
==> Pouring python-3.7.4_1.mojave.bottle.1.tar.gz
==> /usr/local/Cellar/python/3.7.4_1/bin/python3 -s setup.py --no-user-cfg insta
==> /usr/local/Cellar/python/3.7.4_1/bin/python3 -s setup.py --no-user-cfg insta
==> /usr/local/Cellar/python/3.7.4_1/bin/python3 -s setup.py --no-user-cfg insta
==> Caveats
Python has been installed as
  /usr/local/bin/python3

Unversioned symlinks `python`, `python-config`, `pip` etc. pointing to
`python3`, `python3-config`, `pip3` etc., respectively, have been installed into
  /usr/local/opt/python/libexec/bin

If you need Homebrew's Python 2.7 run
  brew install python@2

You can install Python packages with
  pip3 install <package>
They will install into the site-package directory
  /usr/local/lib/python3.7/site-packages

See: https://docs.brew.sh/Homebrew-and-Python
==> Summary
🍺  /usr/local/Cellar/python/3.7.4_1: 3,958 files, 60.5MB
$ pip
-bash: pip: command not found
$ python3 --version
Python 3.7.4
$ pip3 --version
pip 19.2.3 from /usr/local/lib/python3.7/site-packages/pip (python 3.7)
#python (2) #brew (2)
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