* Steven D'Aprano:
On Fri, 23 Apr 2010 13:19:41 +0200, Alf P. Steinbach wrote:
But for a literal context-free interpretation e.g. the 'sys.getrefcount'
function is not documented as CPython only and thus an implementation
that didn't do reference counting would not be a conforming Python
implementation.
Since Jython and IronPython are conforming Python implementations, and
Guido has started making policy decisions specifically to support these
other implementations (e.g. the language feature moratorium, PEP 3003), I
think we can assume that this is a documentation bug.
The documentation for Jython specifies the same for 'sys.getrefcount'.
However, testing:
<output>
*sys-package-mgr*: processing new jar, 'C:\Program Files\jython2.5.1\jython.jar'
*sys-package-mgr*: processing new jar, 'C:\Program
Files\Java\jre6\lib\resources.jar'
*sys-package-mgr*: processing new jar, 'C:\Program Files\Java\jre6\lib\rt.jar'
*sys-package-mgr*: processing new jar, 'C:\Program Files\Java\jre6\lib\jsse.jar'
*sys-package-mgr*: processing new jar, 'C:\Program Files\Java\jre6\lib\jce.jar'
*sys-package-mgr*: processing new jar, 'C:\Program
Files\Java\jre6\lib\charsets.jar'
*sys-package-mgr*: processing new jar, 'C:\Program
Files\Java\jre6\lib\ext\dnsns.jar'
*sys-package-mgr*: processing new jar, 'C:\Program
Files\Java\jre6\lib\ext\localedata.jar'
*sys-package-mgr*: processing new jar, 'C:\Program
Files\Java\jre6\lib\ext\sunjce_provider.jar'
*sys-package-mgr*: processing new jar, 'C:\Program
Files\Java\jre6\lib\ext\sunmscapi.jar'
*sys-package-mgr*: processing new jar, 'C:\Program
Files\Java\jre6\lib\ext\sunpkcs11.jar'
A created
Traceback (most recent call last):
File "c:\test\refcount.py", line 17, in <module>
writeln( str( sys.getrefcount( a ) - 1 ) )
AttributeError: 'systemstate' object has no attribute 'getrefcount'
</output>
However, a Python implementation that always returned 0 for
sys.getrefcount would technically satisfy the word of the documentation,
if not the spirit.
Yes.
OK, learned something new: I though Jython actually implemented getrefcount.
The Jython docs says it does...
Cheers,
- Alf
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