Python 3 using anaconda on iMac

Download the text installer, Anaconda…sh then make it excecutable and run without sudo.

chmod +x Anaconda...sh
./Anaconda...sh

After you install anaconda, python3.x will be your new default python as anaconda modifies the .bash_profile

If you'd prefer that conda's base environment not be activated on startup, 
   set the auto_activate_base parameter to false: 

conda config --set auto_activate_base false