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Mon Aug 9 22:04:41 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-August/047460.html

Fredrik Lundh wrote:

> David Eppstein wrote:
> 
>> With @, a third party tool has an unambiguous indication of whether a
>> line is a decorator.  With |, it is not possible to recognize decorators
>> with a regular expression, instead you have to do some context-free
>> parsing to determine whether some previous line has an unclosed paren
>> (in which case the | is a binop rather than a decorator).
> 
> "\
> @decorator #"
> 
> """
> @decorator
> """
> 
> (etc)

Let me continue the (etc) for you :
"""
def foo():
    return 0
"""

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[Python-Dev] Re: Decorators: vertical bar syntax