Interactive interpreter hooks

[Fábio Santos]

On 3 Jun 2013 09:04, "Steven D'Aprano" <steve+comp.lang.python at pearwood.info>
wrote:
>
> The sys module defines two hooks that are used in the interactive
> interpreter:
>
> * sys.displayhook(value) gets called with the result of evaluating the
> line when you press ENTER;
>
> * sys.excepthook(type, value, traceback) gets called with the details of
> the exception when your line raises an exception.
>
> Is there a way to hook into the interactive interpreter *before* it is
> evaluated? That is, if I type "len([])" at the prompt and hit ENTER, I
> want a hook that runs before len([]) is evaluated to 0, so that I get the
> string "len([])".
>

I don't know whether that is possible, but you could recreate the repl.
This page seems to have good resources for that:
http://stackoverflow.com/questions/1395913/python-drop-into-repl-read-eval-print-loop

A trace function could also work. See docs for sys.settrace. The source
code for the python GOTO module is a good example of its usage.
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