[Jython-bugs] [ jython-Bugs-1052913 ] difference in behavior when comparing the empty tuple

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Bugs item #1052913, was opened at 2004-10-23 20:47
Message generated for change (Settings changed) made by pedronis
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Category: Core
Group: None
>Status: Closed
>Resolution: Wont Fix
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
Assigned to: Nobody/Anonymous (nobody)
Summary: difference in behavior when comparing the empty tuple

Initial Comment:
Examples with various implementations of Python
comparing the empty tuple to itself.

Jython 2.1 on java1.4.2_05 (JIT: null)
Type "copyright", "credits" or "license" for more
information.
>>> () is ()
0


Python 2.3.4 (#53, May 25 2004, 21:17:02) [MSC v.1200
32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for
more information.
>>> () is ()
True

Python 2.2.3 (#42, May 30 2003, 18:12:08) [MSC 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for
more information.
>>> () is ()
1

Python 1.5.2 (#0, Jun 10 2002, 15:44:54) [MSC 32 bit
(Intel)] on win32
Copyright 1991-1995 Stichting Mathematisch Centrum,
Amsterdam
>>> () is ()
1

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>Comment By: Samuele Pedroni (pedronis)
Date: 2004-10-23 22:00

Message:
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user_id=61408

the fact that the empty tuple is a singleton in CPython is
an implementation detail.

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