python_environments.md

To run both python2 and python3 on the same machine, try this:

• download and install python 3 from anaconda https://www.anaconda.com/download/#macos
• conda create -n py3.6
• conda search python
• locate the most recent version of python 2. At this writing (March 6, 2018) it was 2.7.14
• conda create -n py2.7.14 python=2.7.14

now you can "activate" either python3 or python2 by typing"

• source activate py2.7.13 for python 2
• source activate py3.6 for python 3

and deactivate by typing

• source deactivate for each

Make sure to activate python3

• source activate py3.6

set up your mirror or "channel" for downloading packages

• conda config --add channels bioconda
• conda config --add channels anaconda

search for a package

• conda search biopython

install a package

• conda install -n py3.6 biopython=1.70

To list your environments conda info --envs

If the package you want to install is not found by the conda search or the most recent version is not present and you need to install with pip

• source activate py3.6
• pip install package