Python3.7 setup on Mac 10.14 (Mojave)

1. Install python3.7 & pip3.md

1. Install Python 3.7.x from https://www.python.org/downloads/ or via homebrew.

$ brew install python3   # Installed at /usr/local/Cellar/python3

Check that python3 has been installed by running it at the terminal:

$ python3
>>> Python 3.7.2

2. Download get-pip.py from https://bootstrap.pypa.io/get-pip.py and install (this should already be installed if python was installed from python.org or homebrew):

$ curl -O https://bootstrap.pypa.io/get-pip.py
$ sudo python3 get-pip.py

3. Install virtualenv and virtualenvwrapper

$ sudo -H pip3 install virtualenv
$ sudo -H pip3 install virtualenvwrapper --ignore-installed six

4. Add the following to your ~/.bash_profile to load virtualenvwrapper then run bash -l

# Location of python virtual environments
export WORKON_HOME=$HOME/.virtualenvs

if [ -e /usr/local/bin/virtualenvwrapper.sh ]; then
  source /usr/local/bin/virtualenvwrapper.sh
fi

5. Create your virtual enviornment named py3

$ mkvirtualenv --python=`which python3` py3

2. requirements.txt

/*
* To install all modules: pip3 install -r requirements.txt
*/

bokeh
Flask
ipython
jupyter
keras
matplotlib
nose
numpy
pandas
Pillow
pymc
requests
scikit-image
scikit-learn
scipy
seaborn
statsmodel
tensorflow

3. opencv with python3.7.md

Installing opencv with python3.7

$ brew update
$ brew install opencv@3 --with-python3   # Add --with-contrib if you want the contrib modules
$ ln -s /usr/local/Cellar/opencv/3.4.5/lib/python3.7/site-packages/cv2/python-3.7/cv2.cpython-37m-darwin.so /usr/local/lib/python3.7/site-packages/cv2.so

You may have to export PYTHONPATH:

export PYTHONPATH=$PYTHONPATH:/usr/local/Cellar/opencv/3.4.5/lib/python3.7/site-packages

If you installed a previous version of opencv and no longer need it, remove it:

brew cleanup opencv

Test:

$ python3
In[1]: import cv2
In[2]: cv2.__version__
Out[2]: '3.4.5'

4. Other python3 modules.md

Install these modules from Github as their py3 support is currently not published on PyPI. Their master branch works with Python3.7

Set your locale in an environment variable in ~/.bash_profile

export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8

Type bash -l in your terimal to run the updated bash_profile.
Now, install the modules:

$ pip3 install git+git://github.com/cython/cython@master
$ pip3 install git+git://github.com/statsmodels/statsmodels
$ pip3 install git+git://github.com/pymc-devs/pymc3

5. Install numba.md

$ brew install llvm
$ brew link llvm --force
$ pip3 install numba

Test code from numba

Install Python 3.6.x from https://www.python.org/downloads/

Easier said than done. I'm running OSX 10.13.2, and I tried to install python3.6.4 from the tar file Python3.6.4.tgz. The README.rst file says:

Build Instructions

On Unix, Linux, BSD, macOS, and Cygwin::

./configure
make
make test
sudo make install

This will install Python as python3.

But the make test step (or the make step depending on the ./configure flags you use) hangs forever on a line that says test_asyncio. I filed a bug report.

Hey, brew install python3 now installs python3.7, not python3.6

how to install python3.6 instead of python3.7 using brew

@haijohn, you could brew install pyenv, and then pyenv install 3.6.5 for example.