Conda treats Python the same as any other package, so it’s very easy to manage and update multiple python installations under one computer. For instance, if you want to install different version of python in the same window env but without wipe out the current version of python, you can create and activate a new virtual environment with specific name and install your required version of Python as follows instruction.
Install Python 3.5 under Python 2.7
1. install new python with command: $ conda create -n py35 python=3.5 anaconda
2. activate the new setup python with command: $ activate py35
3. deactivate with command: $ deactivate