[mark@toy ~/PP2ndEd/dev/examples/Part3/Extend/Stacks]$ python
Python 1.5.2 (#16, Oct 19 1999, 15:47:45)  [GCC egcs-2.91.66 19990314/Linux (egcs- on linux2
Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam
>>> import oopstack, substack
>>> x = oopstack.Stack()
>>> y = oopstack.Stack()
>>> x.push('class')
>>> for c in "SPAM": y.push(c)
...
>>> x
[Stack:
0: 'class'
]

>>> y[2]
'A'
>>> z = x + y
>>> for s in z: print s,
...
class S P A M
>>> len(z)
5
>>> x * 2
[Stack:
1: 'class'
0: 'class'
]

>>> z.__methods__, z.__members__, z.pop()
(['empty', 'pop', 'push', 'top'], ['len'], 'M')
>>> type(z), type(z._base)
(<type 'instance'>, <type 'stack'>)
>>>
>>> a = substack.Substack(x + y)
>>> a
[Stack:
4: 'M'
3: 'A'
2: 'P'
1: 'S'
0: 'class'
]

>>> a[3]
accessing cell 3
'A'
>>> a.morestuff()
more stack stuff
>>> b = substack.Substack("C" + "++")
>>> b
[Stack:
2: '+'
1: '+'
0: 'C'
]

>>> b.pop(), b.pop()
('+', '+')
>>> c = b + substack.Substack(['-', '-'])
>>> for s in c: print s,
...
C - -
>>>