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Showing content from https://mail.python.org/pipermail/python-dev/2004-August/047459.html below:

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

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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)

</F>

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