Python 3 + Anaconda (data science ecosystem)

• https://www.python.org/dev/peps/pep-0020/

import this

The Zen of Python, by Tim Peters

• Beautiful is better than ugly.
• Explicit is better than implicit.
• Simple is better than complex.
• Complex is better than complicated.
• Flat is better than nested.
• Sparse is better than dense.
• Readability counts.
• Special cases aren't special enough to break the rules.
• Although practicality beats purity.
• Errors should never pass silently.
• Unless explicitly silenced.
• In the face of ambiguity, refuse the temptation to guess.
• There should be one-- and preferably only one --obvious way to do it.
• Although that way may not be obvious at first unless you're Dutch.
• Now is better than never.
• Although never is often better than right now.
• If the implementation is hard to explain, it's a bad idea.
• If the implementation is easy to explain, it may be a good idea.
• Namespaces are one honking great idea -- let's do more of those!

Xcode

Check if command line tools is installed

xcode-select -p

Install Xcode

xcode-select --install

Brew Python 3 Formula

• http://brewformulas.org/Python3

Search

brew search python

Install

brew install python3

Upgrade

brew upgrade python3

Pip3

Upgrade

pip3 install --upgrade pip setuptools wheel

Install

pip3 install wheel

pip3 install numpy

Help

pip3 -h

List installed packages

pip3 list

Show information about installed packages

pip3 show pip setuptools wheel

Show Python version

python3 -V

Python 3.x.x

Create a virtual environment (venv)

Virtual environments are isolated spaces for our Python projects.

python3 -m venv my_env

Activate and use the environment

source my_env/bin/activate

Feel free to use the command python instead of python3, and pip instead of pip3.

python -V

Python 3.x.x

To leave the environment

deactivate

python -V

Python 2.x.x

To re-activate the environment

source my_env/bin/activate

python -V

Python 3.x.x

Anaconda data science ecosystem

• https://docs.continuum.io/anaconda/install

Search

brew search anaconda

caskroom/cask/anaconda

Install

brew cask install caskroom/cask/anaconda

brew cask install miniconda

Add to our PATH environment variable

atom ~/.bash_profile

export PATH="/usr/local/anaconda3/bin:/usr/local/miniconda3/bin:$PATH"

Note: Cask anaconda installs files under /usr/local. The presence of such files can cause warnings when running brew doctor, which is considered to be a bug in Homebrew-Cask.

Conda

• https://docs.continuum.io/anaconda

• https://conda.io/docs/py2or3.html

Create environment

conda create --name tf python=3

python -V

Python 2.7.10

source activate tf

python -V

Python 3.6.1 :: Continuum Analytics, Inc.

Show conda environments

conda info --envs

# conda environments:
#
tf                    *  /usr/local/anaconda3/envs/tf
root                     /usr/local/anaconda3

List all packages

conda list

# packages in environment at /usr/local/anaconda3/envs/tf:
#
openssl                   1.0.2l                        0
pip                       9.0.1                    py36_1
python                    3.6.1                         2
readline                  6.2                           2
setuptools                27.2.0                   py36_0
sqlite                    3.13.0                        0
tk                        8.5.18                        0
wheel                     0.29.0                   py36_0
xz                        5.2.2                         1
zlib                      1.2.8                         3

Search for a package

conda search numpy

Install a package

conda install --name tf numpy

Launch anaconda navigator

• https://docs.continuum.io/anaconda/navigator/getting-started

cd ~/Sites/tf

source activate tf

anaconda-navigator

jupyter notebook

Jupyter notebook

• http://jupyter.org/install.html

Install

Open

jupyter notebook

New

Run