dict tuple update

[Roy Smith]

Tertius <tertiusc at netscape.net> wrote:
> # I need to change all None values in the tuple values to "" (empty
> # string) Errors happen when trying to update the tuple. I presume its # 
> # because a dict value is referenced. I tried copy and deepcopy but no # 
> # luck.
> #     t[j] = ""
> # TypeError: object doesn't support item assignment

The problem is that tuples are immutable.  It's got nothing to do with 
the fact that they're stored in a dict.  You'll get the same result with 
an isolated tuple:

>>> t = ("title1", "", None, None, None)
>>> t[2] = ''
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: object doesn't support item assignment

If you want to be able to update the values, you'll need to store them 
in a list, not a tuple.