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• Follow the instructions here to install Homebrew and then (re)install python.
• If for some reason the step above does not install pip and virtualenv, follow the instructions here to get pip and then install virtualenv using pip install virtualenv.
• Install the foreman gem for accessing environmental variables: $ gem install foreman
• Optional (advanced features): Install the latest stable version of postgres 9. (http://postgresapp.com/)[Postgresapp for Mac] is quite easy to install.

• $ sudo apt-get install postgresql libpq-dev ngrok-client ngrok-server

• $ cd into your projects/workspaces directory and run $ git clone https://github.com/blockcypher/explorer.git. The result of $ git remote -v should look like this:

origin	git@github.com:blockcypher/explorer.git (fetch)
origin	git@github.com:blockcypher/explorer.git (push)

• $ cd explorer/ to get to the project root direction, create a python3 virtual environment ($ virtualenv -p python3 venv) and then activate it ($ source venv/bin/activate)
• Install requirements: $ pip3 install -r requirements.txt (this will take a few mins)
• Create a .env file in the project root directory with the following:

DEBUG=True
TEMPLATE_DEBUG=True
DJ_DEFAULT_URL=postgres://postgres:YOURLOCALPASSWORDHERE@localhost:5432/explorer_local
SECRET_KEY=RANDOMLY_GENERATED_50CHAR_STRING
SITE_DOMAIN=pick_this_yourself.ngrok.com
BLOCKCYPHER_API_KEY=PUT_YOURS_HERE

(these are for your local machine, production is a little different as settings.py is smartly designed to default to production settings)

• Create a database on your local machine with whatever name you like. I recommend explorer_local so it's clear you're working on a local copy. You'll be using this above in DJ_DEFAULT_URL. I've assumed your user is postgres, but you could have a different user.
• Create DB tables from code (replace foreman with heroku for running on production, which should basically never happen again):

# Create tables and run migrations:
$ foreman run python3 manage.py migrate

Run the webserver locally:

$ foreman run python3 manage.py runserver

Now visit: http://127.0.0.1:8000/

First, pull the latest version of the code from github:

$ git pull origin master

Make a new branch:

$ git checkout -b my_branch

Make some trivial change and commit it:

$ git commit -am 'my changes'

Push it up to github:

$ git push origin my_branch

You can submit your pull request here: https://github.com/blockcypher/explorer

Congrats, you're all setup!

You're on your own for that.

Compare your local version of site to what's on github:

$ git log origin/master..HEAD --oneline