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Wed Sep 2 18:36:54 CEST 2009 · http://mail.python.org/pipermail/python-dev/2009-September/091564.html

James Y Knight wrote:
> On Sep 2, 2009, at 6:15 AM, Rob Cliffe wrote:
> 
>> So - the syntax restriction seems not only inconsistent, but 
>> pointless; it doesn't forbid anything, but merely means we have to do 
>> it in a slightly convoluted (unPythonesque) way.  So please, Guido, 
>> will you reconsider?
> 
> Indeed, it's a silly inconsistent restriction. When it was first added I 
> too suggested that any expression be allowed after the @, rather than 
> having a uniquely special restricted syntax. I argued from consistency 
> of grammar standpoint. But Guido was not persuaded. Good luck to you. :)
> 
[snip]
I can see no syntactic reason to restrict what can appear after the @.
If someone chooses to abuse it then that's unPythonic, but not illegal.

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[Python-Dev] Decorator syntax