I'd suggest downloading miniconda: http://conda.pydata.org/miniconda.html#miniconda. Miniconda has a small footprint -- only python and conda are installed. Conda is a universal package manager for Python available on all OSes. You can now run the following:
conda create -n dev_env scipy numpy matplotlib sympy
The above will create a contained environment (named dev_env) with only the packages listed in the command. For more information on conda: http://conda.pydata.org/