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Setting Up OSX For Python Developments
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setting_up_osx_for_python_developments.md

Setting Up OSX For Python Developments

This gist has been created using OSX Mavericks, but it sould work with any OSX 64-bits system – Mountain Lion, Mavericks and for sure Yosemite ;) In case that you are using a OSX 32-bits system OSX Lion or Snow Leopard (OSX Leopard is not supported by XCode) just include the 32-bits System? section.

Bash profile setup

64-bits System

OS X Mountain Lion, Mavericks & Yosemite are full 64-bit systems so lets configure them to ensure that incoming user's package installations (e.g., Homebrew package installations) will be on a 64 bits system and taking precedence over OSX packaged binaries.

  • Create or edit a bash profile file, vim ~/.bash_profile and include the following

64 bits user's package installations

export ARCHFLAGS="-arch x86_64"

User's binaries

export PATH=/usr/local/bin:/usr/local/sbin:$PATH

Load .bashrc if it exists

test -f ~/.bashrc && source ~/.bashrc


- Re-load the bash environment configuration `. ~/.bash_profile`

### 32-bits System?

In case that are you using a **OSX 32-bits system** OSX Lion or Snow Leopard (OSX Leopard is not supported by **XCode** which is **required** for `Homebrew` installation)...

- **Remove the lines** related with 64 bits `bash_profile` file that **you included before**.

    ```
# 64 bits user's package installations
export ARCHFLAGS="-arch x86_64"
  • Re-load the bash environment configuration . ~/.bash_profile

Homebrew (AKA Brew)

Installation

  • Get XCode from the Apple App Store.

  • Install XCode Command Line Tools. xcode-select --install

  • Download and install brew. ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

  • Check that brew has been installed correctly. brew doctor

Packages

There are hundreds of packages that will match your needs, but I will include a bunch that fit mines.

  • Python 2.x brew install python --with-brewed-openssl
  • Python 3.x brew install python3 --with-brewed-openssl
  • Git brew install git
  • Wget brew install wget

NOTE: If you want to search for a package, just type brew search PACHAGE_NAME.

Python

Virtual Environments

With Python 2.x pip installer, install virtualenv & virtualenvwrapper

  • Setup Tools pip install --upgrade setuptools
  • PIP pip install --upgrade pip
  • Virtual Environment pip install virtualenv
  • Virtual Environment Wrapper pip install virtualenvwrapper

Restricting pip to virtual environments

  • Create or edit a bashrc file, vim ~/.bashrc and include the following

pip should only run if there is a virtualenv currently activated

export PIP_REQUIRE_VIRTUALENV=true

cache pip-installed packages to avoid re-downloading

export PIP_DOWNLOAD_CACHE=$HOME/.pip/cache

turning off pip restriction for install or upgrade a global package

e.g.: syspip install --upgrade pip setuptools virtualenv

syspip(){ PIP_REQUIRE_VIRTUALENV="" pip "$@" }


- Re-load the bash environment configuration `. ~/.bash_profile`

#### Virtual Environments Wrappers

In case that is not installed yet,  `pip install virtualenvwrapper`.

- Add to your `bashrc` shell startup file the `WORKON_HOME` directory (`$HOME/.virtualenvs`?), the `PROJECT_HOME` directory (`$HOME/workspace`?) and the command to vistualenvwrapper.sh script file  (`/usr/local/bin/virtualenvwrapper.sh`?)

    ```
# Virtual Environment Wrapper
export VIRTUALENVWRAPPER_PYTHON=`which python`
export VIRTUALENVWRAPPER_VIRTUALENV=`which /virtualenv`
export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=$HOME/workspace
source /usr/local/bin/virtualenvwrapper.sh
  • Source the bashrc file and create the WORKON_HOME directory. . ~/.bashrc && mkdir -p $WORKON_HOME

Not familiar with virtualenvwrapper?, no worries. virtualenvwrapper command reference

python2.x and python3.x?

Just add an alias to your python3 binary:

alias mkvirtualenv3='mkvirtualenv --python=`echo $(which python3)`'

Git

Bash

If you want to get on the terminal prompt the current branch in which you are working, just...

  • Open ~/.bash_profile in your favourite text editor and add the following content to the bottom.

Git branch in prompt

parse_git_branch() { git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* (.*)/ (\1)/' } export PS1="\u@\h \W[\033[32m]$(parse_git_branch)[\033[00m] $ "


- Re-load the bash environment configuration `. ~/.bash_profile`


## Databases

### PostgreSQL

The easiest way to include a PostgreSQL database system into a OSX is installing [**Postgres.app**](http://postgresapp.com/). Is is as most of OSX installers, unzip it and move into `Applications` folder.  Include to your `bash_profile` file the following `PATH="/Applications/Postgres.app/Contents/Versions/9.3/bin:$PATH"` and source the file `. ~/.bash_profile`

**Note:** The current version of Postgres.app while I am writing this, is 9.3. So the above line may differ depending what version have you installed.


## IDE 

### SublimeText 3

##### Packages

SublimeText has no sense to use it as a IDE if you don't install some packages to make your coding easier and more readable while you code. You can drop a SublimeText package into the right directory (to get the right directory, `Preferences -> Browse Packages`) or you can just take advantage of using **Package Control**.

##### Package Control

###### Installation

If necessary, follow the [official installation guide] (https://sublime.wbond.net/installation).

**Note** Keep in mind that some package installation may require the following steps.

- `⌘ + ⇧ + p`
- Search for `Package Control: Install Package` in the command palette autocomplete dropdown box.
- Press `Enter`


##### Settings

{ "indent_to_bracket": true, "shift_tab_unindent": true, "translate_tabs_to_spaces": true, "trim_trailing_white_space_on_save": true, "ensure_newline_at_eof_on_save": true, "wrap_width": 80, "rulers": [ 79, 99 ], "folder_exclude_patterns": [ ".svn", ".git", ".hg", "CVS", "pycache" ], }


##### Packages

- [Anaconda](https://sublime.wbond.net/packages/Anaconda)
- [Git](https://sublime.wbond.net/packages/Git) & [GitGutter](https://sublime.wbond.net/packages/GitGutter)
- [SideBarEnhancements](https://sublime.wbond.net/packages/SideBarEnhancements)
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