[IPython-dev] Re: Question about IPython behaviour
Fernando.Perez at colorado.edu
Wed Jul 27 00:48:37 CDT 2005
Robert Kern wrote:
> Tzanko Matev wrote:
>>The prefilter() method turns strings consisting only of whitespace to
>>empty strings. This means that in IPython I cannot write the following
>>In: if 1==1:
>> ... ___print 1
>> ... ___
>> ... ___print2
>>(here I have replaced spaces with underscore). prefilter() will turn the
>>third line into an empty string and the interpreter will decide that the
>>block ends there. This differs from the behaviour of the standard
>>interpreter where the code would run as expected. So is this a bug or a
>>feature? I think that empty lines should be allowed in the GUI.
> So code to a different interface like the one in notabene.executor. The
> GUI decides when the input is complete, sends it whole to the
> interpreter, and gets a response back.
I second Robert's suggestion. The reason for ipython's behavior is partly to
mimic the default '>>>' interpreter, partly because it's tricky to do
otherwise in a line-oriented environment. The default python shell simply
uses the convention 'a single empty line signals the end of input'. IPython
inherits from code.InteractiveConsole, which maintains this behavior.
While not ideal, I think that's not terrible for a simple line-oriented system
which doesn't really offer any serious multiline editing. But now that we are
migrating to a GUI, we should most certainly offer a way to have blank lines.
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