brew install python

October 01, 2017 (Last Modified: April 01, 2018)
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Just for the record as some environments are mentioned
mbpr15:working cychong$ brew install python
==> Installing dependencies for python: readline, sqlite, gdbm, openssl
==> Installing python dependency: readline
==> Downloading https://homebrew.bintray.com/bottles/readline-7.0.3_1.high_sierra.bottle.tar.gz
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==> Pouring readline-7.0.3_1.high_sierra.bottle.tar.gz
==> Caveats
This formula is keg-only, which means it was not symlinked into /usr/local,
because macOS provides the BSD libedit library, which shadows libreadline.
In order to prevent conflicts when programs look for libreadline we are
defaulting this GNU Readline installation to keg-only..

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/readline/lib
    CPPFLAGS: -I/usr/local/opt/readline/include

==> Summary
🍺  /usr/local/Cellar/readline/7.0.3_1: 46 files, 1.5MB
==> Installing python dependency: sqlite
==> Downloading https://homebrew.bintray.com/bottles/sqlite-3.20.1.high_sierra.bottle.tar.gz
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==> Pouring sqlite-3.20.1.high_sierra.bottle.tar.gz
==> Caveats
This formula is keg-only, which means it was not symlinked into /usr/local,
because macOS provides an older sqlite3.

If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/sqlite/bin:$PATH"' >> ~/.bash_profile

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/sqlite/lib
    CPPFLAGS: -I/usr/local/opt/sqlite/include

==> Summary
🍺  /usr/local/Cellar/sqlite/3.20.1: 11 files, 2.9MB
==> Installing python dependency: gdbm
==> Downloading https://homebrew.bintray.com/bottles/gdbm-1.13.high_sierra.bottle.tar.gz
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==> Pouring gdbm-1.13.high_sierra.bottle.tar.gz
🍺  /usr/local/Cellar/gdbm/1.13: 19 files, 553.9KB
==> Installing python dependency: openssl
==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2l.high_sierra.bottle.tar.gz
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==> Pouring openssl-1.0.2l.high_sierra.bottle.tar.gz
==> Caveats
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
  /usr/local/etc/openssl/certs

and run
  /usr/local/opt/openssl/bin/c_rehash

This formula is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.

If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/openssl/lib
    CPPFLAGS: -I/usr/local/opt/openssl/include

==> Summary
🍺  /usr/local/Cellar/openssl/1.0.2l: 1,709 files, 12.3MB
==> Installing python
==> Downloading https://homebrew.bintray.com/bottles/python-2.7.14.high_sierra.bottle.tar.gz
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==> Pouring python-2.7.14.high_sierra.bottle.tar.gz
==> /usr/local/Cellar/python/2.7.14/bin/python2 -s setup.py --no-user-cfg install --force --verbose --single-v
==> /usr/local/Cellar/python/2.7.14/bin/python2 -s setup.py --no-user-cfg install --force --verbose --single-v
==> /usr/local/Cellar/python/2.7.14/bin/python2 -s setup.py --no-user-cfg install --force --verbose --single-v
==> Caveats
This formula installs a python2 executable to /usr/local/bin.
If you wish to have this formula's python executable in your PATH then add
the following to ~/.bash_profile:
  export PATH="/usr/local/opt/python/libexec/bin:$PATH"

Pip and setuptools have been installed. To update them
  pip2 install --upgrade pip setuptools

You can install Python packages with
  pip2 install <package>

They will install into the site-package directory
  /usr/local/lib/python2.7/site-packages

See: https://docs.brew.sh/Homebrew-and-Python.html
==> Summary
🍺  /usr/local/Cellar/python/2.7.14: 3,517 files, 48.4MB