Managing python versions with Anaconda

ana.py

## If python 3.5, say, has been installed but you want to use v2.7 for 
## a particular project

# Create environment for different (or specific) version of python:
conda create -n py27 python=2.7 anaconda

# Check available environments (optional)
# conda info --envs

# Activate this python version:
source activate py27

# ... do stuff ... #

# Deactivate this environment
source deactivate