Use cases for del
reinhold-birkenfeld-nospam at wolke7.net
Wed Jul 6 22:23:03 CEST 2005
Ron Adam wrote:
> Ron Adam wrote:
>> And accessing an undefined name returned None instead of a NameError?
> I retract this. ;-)
> It's not a good idea. But assigning to None as a way to unbind a name
> may still be an option.
IMO, it isn't. This would completely preclude the usage of None as a value.
None is mostly used as a "null value". The most prominent example is default
def foo(bar, baz=None):
With None unbinding the name, what would you suggest should happen? baz being
undefined in the function scope?
Or, what should happen for
somedict = None
The same as
? Also, the concept of _assigning_ something to a name to actually _unassign_
the name is completely wrong.
Of course, this is a possible way to unassign names if (and only if)
(1) there is a real "undefined" value (not None)
(2) unbound names return the undefined value
Look at Perl. Do we want to be like that? ;)
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