Why not just save those words, and other commonly used words to a startup file? Then, you can just do

    export PYTHONSTARTUP=/home/savant_penguin/.python/startup.py

and those things will be automatically loaded for you. (Edit: add that line to your .bashrc if you want to use it all or most of the time!)

If you don't want them always loaded, but rather just for a "calculator mode," you can do something like

    alias pycalc='PYTHONSTARTUP=/home/savant_penguin/.python/ipython startup_calc_mode.py'

If you use ipython, then you can take advantage of autocomplete and not have to type as much, too.