Make an equation input GUI using ipywidgets

[gutow]

For use by beginning students it might help to have a GUI/palette-like way of building equations that generates the expression for defining an equation that could then be copy/pasted into a cell. Suggested by some general chemistry instructors.

[gutow]

I actually prefer forcing them to practice calculator syntax, as they need practice entering calculations as they would on a calculator.

[gutow]

Something to start with MathLive in another webpage, but with output to sympy syntax not just latex. Then user can copy and paste. Also consider guppy, GuiMath and mathquill.