RetroSearch Browse

Thu Jun 8 01:25:34 CEST 2006 · https://mail.python.org/pipermail/python-dev/2006-June/065677.html

This is by design.

The intent is that as long as you call something that returns no
value, your last result is not thrown away. IOW _ is the last result
that wasn't None.

Please don't change this.

--Guido

On 6/7/06, Raymond Hettinger <raymond.hettinger at verizon.net> wrote:
> When the result of an expression is None, the interactive interpreter
> correctly suppresses the display of the result.  However, it also
>  suppresses the underscore assignment.  I'm not sure if that is correct
>  or desirable because a subsequent statement has no way of knowing
>  whether the underscore assignment is current or whether it represents an
>  earlier non-None result.
>
>  Here's an example from a co-worker's regular expression experiments:
>
> >>> import re, string
> >>> re.search('lmnop', string.letters)
> <_sre.SRE_Match object at 0xb6f2c480>
> >>> re.search('pycon', string.letters)
> >>> if _ is not None:
>  ...         print _.group()
> lmnop
>
>
>
>  Raymond
>
>
> _______________________________________________
> Python-Dev mailing list
> Python-Dev at python.org
> http://mail.python.org/mailman/listinfo/python-dev
> Unsubscribe: http://mail.python.org/mailman/options/python-dev/guido%40python.org
>

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://mail.python.org/pipermail/python-dev/2006-June/065677.html below:

[Python-Dev] Is implicit underscore assignment buggy?