Implementing it makes this "crazy" check in
http://bugs.python.org/issue3767
(http://bugs.python.org/file12043/tkColorChooser.diff) be no longer needed

The patch changes _tkinter.c so can a C guru take a look please.

I'd call this a new feature;  removing 2.7 and 3.1 from versions.

The patch needs updating for py3k, which should be a fairly simple task.

I don't know much about Tcl, but wouldn't this change give quite confusing results for numeric values?  Presumably, all integers and floats would have a bool() of True?  (Or am I misunderstanding?)  I'm not sure what the value of implementing __nonzero__ is if it only works as expected for strings.

Mark,

If you want to expand it to handle other data types, I'm ok with it
but I predict troubles for you. The problem is that in Tcl there is
only one "real" data type -- string. Depending on how you operate over
a value it is then, internally, treated as something more specific but
this is not directly exposed for the "API users".

> If you want to expand it to handle other data types, I'm ok with it
> but I predict troubles for you.

Yes, I suspected as much.  I don't know much Tcl, but I'm definitely prepared to believe you on this point. :)  I'd be fine with this patch if there's some documentation somewhere that points out that the bool() might give unexpected results (for Python users) for zeros, empty lists, etc.

I assume that Tcl_GetCharLength works for any object, regardless of its internal representation?

Can you update the patch for py3k, and add docs and tests?

> I assume that Tcl_GetCharLength works for any object, regardless of
> its internal representation?

I didn't look at its code but I assume it will create a string representation for the object in question if there isn't one in place when the call happens, so this means I /believe/ it will work for any Tcl object.

> Can you update the patch for py3k, and add docs and tests?

I can do it (maybe the test part may not be excellent), but not at this moment.

Btw, I'm happy that you mentioned that doc requirement about unexpected results because I was going to write about it in my previous reply but I thought my English could hurt its meaning and negatively affect you.