Message590

###
### list() in CPython
###

[localhost:~] dinu% python
Python 2.2 (#1, Feb 13 2002, 11:18:45) 
[GCC 2.95.2 19991024 (release)] on darwin
Type "help", "copyright", "credits" or "license" for 
more information.
>>> 
>>> L = [1, 2, 3]
>>> L2 = list(L)
>>> L2
[1, 2, 3]
>>> L2.insert(0, 4)
>>> L2
[4, 1, 2, 3]
>>> L
[1, 2, 3]    ### as expected, same on CPython 2.1


###
### list() in Jython
###

[localhost:~] dinu% jython 
Jython 2.1 on java1.3.1 (JIT: null)
Type "copyright", "credits" or "license" for more 
information.
>>> 
>>> L = [1, 2, 3]    
>>> L2 = list(L)
>>> L2
[1, 2, 3]
>>> L2.insert(0, 4)
>>> L2
[4, 1, 2, 3]
>>> L
[4, 1, 2, 3]    ### unexpected
>>> 
>>> 
>>> import copy 
>>> L = [1, 2, 3]
>>> L3 = copy.copy(L) # instead of list() (use only 
for this snippet)
>>> L3.insert(0, 4)
>>> L3
[4, 1, 2, 3]
>>> L
[1, 2, 3]    ### as expected