On 8/21/06, Marcus Goldfish <[EMAIL PROTECTED]> wrote:
First, a better example class:
class MyFoo(list):
def __init__(self, inlist):
list.__init__(self, inlist)
Second, I think I found a partial answer in the Feb 22, 2005 tutor thread http://aspn.activestate.com/ASPN/Mail/Message/python-tutor/2502290. To preserve type, I need to override some special functions. In the case of slicing, I need to override with something like this:
def __getslice__(self, i, j):
return MyFoo(list.__getslice__(self, i, j))
This seems straightforward, but raises other questions: what other functions should I override, e.g., __add__, __radd__? Is there a preferred pythonic way to creating a custom list container?
Finally, should I slice-copy my input list, inlist, to prevent side effects, or is this handled by list?
Thanks,
Marcus
I'd like to sublcass the built-in list type to create my own container. How can I make slices of the list be of type myclass-- currently they are lists. Example:
>>> class MyFoo(list):
def __init__(self, inlist):
self = inlist[:]
>>> me = MyFoo(range(10))
>>> type(me)
<class '__main__.MyFoo'>
>>> type(me[0:3])
<type 'list'>
First, a better example class:
class MyFoo(list):
def __init__(self, inlist):
list.__init__(self, inlist)
Second, I think I found a partial answer in the Feb 22, 2005 tutor thread http://aspn.activestate.com/ASPN/Mail/Message/python-tutor/2502290. To preserve type, I need to override some special functions. In the case of slicing, I need to override with something like this:
def __getslice__(self, i, j):
return MyFoo(list.__getslice__(self, i, j))
This seems straightforward, but raises other questions: what other functions should I override, e.g., __add__, __radd__? Is there a preferred pythonic way to creating a custom list container?
Finally, should I slice-copy my input list, inlist, to prevent side effects, or is this handled by list?
Thanks,
Marcus
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