On 3 Jun 2013 09:04, "Steven D'Aprano" <steve+comp.lang.pyt...@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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