[Jython-users] list() behavior

[Roberto V. <rvi...@mk...>]

All --

In jython, if 'list1' is a list, should 'list2 = list( list1 )' provide a 
shallow copy as it does in python?  At least in 2.1, it seems to provide just 
an alias.  Assuming this isn't a bug (typically they aren't), can someone 
explain the difference in behavior?  I don't seem to recall reading anything 
about it...  Below are the same code for both jython and python:

Jython 2.1 on java1.5.0_09 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> a = ['my', 'copy', 'test']
>>> a
['my', 'copy', 'test']
>>> b = list( a )
>>> b
['my', 'copy', 'test']
>>> a.reverse()
>>> a
['test', 'copy', 'my']
>>> b
['test', 'copy', 'my']
>>> a is b
1


Python 2.4.4 (#2, Oct 20 2006, 00:23:25)
[GCC 4.1.2 20061015 (prerelease) (Debian 4.1.1-16.1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> a = ['my', 'copy', 'test']
>>> a
['my', 'copy', 'test']
>>> b = list( a )
>>> b
['my', 'copy', 'test']
>>> a.reverse()
>>> a
['test', 'copy', 'my']
>>> b
['my', 'copy', 'test']
>>> a is b
False

Roberto