Both Anaconda and Miniconda offer the conda package manager, which can also be used to manage virtual environments. Open a terminal and use the following command to list all available environments on your system:

>> conda info -e

Use the following command for creating a virtual environment based on Python version 2.7:

>> conda create -n python3packt python=2.7

Activate the environment next as follows:

>> activate python3packt

Multiple additional packages can now be installed with a single command:

>> conda install -n python3packt <package-name1> <package-name2>

This command calls conda directly. 

Deactivate the environment you've been working in as follows:

>> deactivate

More on managing environments with conda can be found at: https://conda.io/docs/user-guide/tasks/manage-environments.html