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How to edit a function in an interactive python session?

–1 vote

R has the function edit() which allows the editing of the definition of a function. Does python have something similar so that users can edit python functions on the fly?


posted Dec 21, 2017 by Gurminder

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1 Answer

0 votes


In the standard interactive interpreter, you can only re-enter the function, either re-typing it, or using the readline "history" to call up each line again. (This may not work under Windows.)

iPython or Jupyter may offer extra editing functionality Or you could try creating your own.

This might be a good place to start:

answer Dec 21, 2017 by Amit Parthsarthi
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+1 vote

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0 votes

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([])".