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Mar 4, 2018
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Homebrew has changed how Python is installed #889

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Homebrew has changed how Python is installed
Mar 4, 2018
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Homebrew changed the way that Python is installed
Mar 4, 2018
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8 changes: 4 additions & 4 deletions docs/starting/install/osx.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -69,13 +69,13 @@ Now, we can install Python 2.7:

.. code-block:: console

$ brew install python
$ brew install python@2

or Python 3:

.. code-block:: console

$ brew install python3
$ brew install python

This will take a minute or two.

Expand All @@ -84,7 +84,7 @@ Homebrew names the executable ``python2`` so that you can still run the system P

.. code-block:: console

$ python -V # system Python interpreter
$ python -V # Homebrew installed Python 3 interpreter (if installed)
$ python2 -V # Homebrew installed Python 2 interpreter
$ python3 -V # Homebrew installed Python 3 interpreter (if installed)

Expand All @@ -107,7 +107,7 @@ and is actively maintained.
.. code-block:: console

$ pip2 -V # pip pointing to the Homebrew installed Python 2 interpreter
$ pip3 -V # pip pointing to the Homebrew installed Python 3 interpreter (if installed)
$ pip -V # pip pointing to the Homebrew installed Python 3 interpreter (if installed)



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22 changes: 6 additions & 16 deletions docs/starting/install3/osx.rst
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Expand Up @@ -62,17 +62,15 @@ Now, we can install Python 3:

.. code-block:: console

$ brew install python3
$ brew install python

This will take a minute or two.


Pip
---

Homebrew installs ``pip3`` for you.

``pip3`` is the alias to ``pip`` pointing to the Homebrew'd Python 3.
Homebrew installs ``pip`` pointing to the Homebrew'd Python 3 for you.

Working with Python 3
---------------------
Expand All @@ -85,7 +83,7 @@ version of Python 3 as well.

$ python

will launch the system Python interpreter.
will launch the homebrew-installed Python 3 interpreter.

.. code-block:: console

Expand All @@ -100,21 +98,13 @@ will launch the homebrew-installed Python 2 interpreter (if any).
will launch the homebrew-installed Python 3 interpreter.

If the Homebrew version of Python 2 is installed then ``pip2`` will point to Python 2.
If the Homebrew version of Python 3 is installed then ``pip3`` will point to Python 3.
If the Homebrew version of Python 3 is installed then ``pip`` will point to Python 3.

The rest of the guide will assume that ``python`` references Python 3. You can simply choose to always invoke ``python3`` instead, and much is backwards compatible. However, performing the following steps will set Python 3 as the default interpreter for ``python`` in a shell.
The rest of the guide will assume that ``python`` references Python 3.

.. code-block:: console

# Do I have a Python 2 problem?
$ python --version
Python 2.7.10 # Referencing OSX system install
$ which python
/usr/bin/python # Yup, homebrew's would be in /usr/local/bin

# Symlink /usr/local/bin/python to python3
$ ln -s /usr/local/bin/python3 /usr/local/bin/python

# Do I have a Python 3 installed?
$ python --version
Python 3.6.4 # Success!
# If you still see 2.7 ensure in PATH /usr/local/bin/ takes pecedence over /usr/bin/
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