subclassing list

[Uwe Mayer]

Hi,

I want to subclass "list". The documentation states to prefer subclassing
list instead of UserList. How to you clear the contents of a list subclass
without creating a new object?

Thanks in advance
Uwe

[Fuzzyman]

Re: subclassing list

class newList(list):
def clear(self):
self[:] = []

is one way.
HTH

Regards,

Fuzzy
http://www.voidspace.org.uk/python/index.shtml

[Richie Hindle]

Re: subclassing list


[Uwe][color=blue]
> How [do] you clear the contents of a list subclass
> without creating a new object?[/color]

Use the paranoia emoticon: "del x[:]". For example:
[color=blue][color=green][color=darkred]
>>> class L(list):[/color][/color][/color]
.... pass
....[color=blue][color=green][color=darkred]
>>> x = L()
>>> x.append("Spam" )
>>> del x[:]
>>> x[/color][/color][/color]
[][color=blue][color=green][color=darkred]
>>> type(x)[/color][/color][/color]
<class '__main__.L'>[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

with-thanks-to-Gordon-McMillan-ly y'rs,

--
Richie Hindle
richie@entrian. com