[Tutor] defined()

Hugo González Monteverde hugonz-lists at h-lab.net
Tue Apr 4 01:00:14 CEST 2006

Alan Gauld wrote:

> Which language(s) do you know that has such a feature?
> And why do you consider it so useful that you expect to find
> it in Python?

I'm not the original poster, but being a perlhead before, I can say it 
exists in Perl. It is very often used too.

I used to miss it at first, but normally I now do the right thing 
semantically. Counting on the variable being defined or not is simply 
another bit of information. Assigning a value for that case is much cleaner.

It is not used for black magic in Perl, AFAIK. Just normal testing.


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