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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: I am never going to complain about Python again
Date: Thu, 10 Oct 2013 20:09:55 -0400
Organization: IISS Elusive Unicorn
References: <52562ee3$0$2931$c3e8da3$76491128@news.astraweb.com> <roy-582B40.09094210102013@news.panix.com>
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Xref: csiph.com comp.lang.python:56623

On Thu, 10 Oct 2013 09:09:42 -0400, Roy Smith <roy@panix.com> declaimed the
following:


>BTW, here's a Python equality oddity:
>
>>>> r = 0.0
>>>> c = 0 + 0j
>>>> r == c
>True
>>>> int(r) == int(c)
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>TypeError: can't convert complex to int
>
>If x == y, then f(x) should also equal f(y).  More specifically, if x == 
>y, and x is in the domain of f(), then y should also be in the domain of 
>f().

	But the int(c) is a downgrade -- it would require losing all
information that the item was an element of the complex plain...

>>> r = 0.0
>>> c = 0 + 0j
>>> r
0.0
>>> c
0j
>>> complex(r) == c
True
>>> 

	Maybe some language exists that considers "c" to be a downgradable
match to "r" (it may even be some language I've used -- but never had to
consider the condition prior). Note that in the above, the representation
of "c" doesn't even display a real component!
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/