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From: Gregory Ewing <greg.ewing@canterbury.ac.nz>
Newsgroups: comp.lang.python
Subject: Re: What is wrong this wrapper (decorator)?
Date: Mon, 16 Nov 2015 19:30:54 +1300
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fl wrote:
> wrapper(sub(two, one))
> Out[38]: <function checker>

This doesn't do what you probably meant it to do.
It first calls sub() with arguments one and two, and
then passes the result of that (a Coordinate, if
sub is working properly) to wrapper(). Since
wrapper() expects a function, not a Coordinate,
that won't do anything useful.

What you probably meant to do is:

wrapper(sub)(one, two)

This passes the function sub to wrapper, which
returns another function; that function is then
called with arguments one and two.

-- 
Greg