IPython magic-like construct for scripts

This is a proposal for something I can implement, but wanted to get some feedback first.

Basically, I find the IPython magic incredibly convenient to pass values back-and-forth between Julia/Python. It'd be nice to have something that works in scripts too. I propose having the function `jl` which takes in a string and executes it just like the IPython magics do. The choice of `jl` is to have a nice symmetry between Julia where you do,

`py" ...Python code... "`

and Python where you'd do,

`jl(" ...Julia code... ")`

The behavior with regards to scope / interpolation / etc would be identical to the Julia magic. Any thoughts?