Bidirectionnal python/tk by talking to tk interpreter back and forth

Last time I exposed an old way learned in physical labs to do C or python/tk like in the old days : by summoning a tcl/tk interpreter and piping commands to it. But what fun is it? It's funnier if the tcl/tk interperpreter talks back to python :D as an hommage to the 25 years awaited TK9 versions that solves a lot of unicode trouble. Beforehand, to make sense to the code a little warning is…