#!/usr/bin/env python # # Copyright 2007 Doug Hellmann. # # # All Rights Reserved # # Permission to use, copy, modify, and distribute this software and # its documentation for any purpose and without fee is hereby # granted, provided that the above copyright notice appear in all # copies and that both that copyright notice and this permission # notice appear in supporting documentation, and that the name of Doug # Hellmann not be used in advertising or publicity pertaining to # distribution of the software without specific, written prior # permission. # # DOUG HELLMANN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, # INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN # NO EVENT SHALL DOUG HELLMANN BE LIABLE FOR ANY SPECIAL, INDIRECT OR # CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS # OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, # NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN # CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. # """Shallow copy example """ __version__ = "$Id$" #end_pymotw_header import copy class MyClass: def __init__(self, name): self.name = name def __cmp__(self, other): return cmp(self.name, other.name) a = MyClass('a') l = [ a ] dup = copy.deepcopy(l) print 'l :', l print 'dup:', dup print 'dup is l:', (dup is l) print 'dup == l:', (dup == l) print 'dup[0] is l[0]:', (dup[0] is l[0]) print 'dup[0] == l[0]:', (dup[0] == l[0])